---
title: 'Proxy vs Reverse Proxy vs Load Balancer | Simply Explained'
source: 'https://youtube.com/watch?v=xo5V9g9joFs'
video_id: 'xo5V9g9joFs'
date: 2026-08-19
duration_sec: 798
channel: 'TechWorld with Nana'
---

# Proxy vs Reverse Proxy vs Load Balancer | Simply Explained

> Source: [Proxy vs Reverse Proxy vs Load Balancer | Simply Explained](https://youtube.com/watch?v=xo5V9g9joFs)

## Summary

This video provides a clear, analogy-driven explanation of three critical web components: proxies, reverse proxies, and load balancers. It uses relatable scenarios like a restaurant and a personal assistant to demystify these concepts, making them accessible to both engineers and curious beginners.

### Key Points

- **Proxy as a Personal Assistant** [00:31] — A proxy server acts as a middleman between a private network and the public internet, filtering traffic and blocking harmful content before it reaches the user. It protects the user's device and can log activity and cache responses.
- **Proxy in a Corporate Setting** [01:31] — In a company, a proxy is configured to route all employee internet traffic, acting as a shield for the internal network. It can blacklist websites, scan responses for viruses, and log user activity to prevent security breaches.
- **Caching and Bandwidth Savings** [02:59] — A proxy can cache responses, such as a video, so that subsequent requests for the same content are served from the local cache, saving bandwidth and reducing unnecessary internet traffic.
- **Reverse Proxy as a Receptionist** [03:38] — A reverse proxy sits on the server side, managing incoming requests from clients and distributing them to the appropriate servers. It acts as a single entry point, protecting the servers and providing features like SSL termination and caching.
- **Cloud Load Balancers vs. Reverse Proxies** [05:58] — Cloud load balancers (e.g., AWS) and reverse proxies (e.g., Nginx) are not replacements but are used together. The cloud load balancer acts as the external entry point, while the reverse proxy handles internal routing and more intelligent, fine-grained load balancing.
- **Advanced Routing Logic** [07:24] — Reverse proxies can route traffic based on headers, cookies, or session data, ensuring that requests from the same user go to the same server. This is crucial in microservices architectures where requests need to be directed to specific services based on URL paths.
- **Application-Level Proxies** [09:26] — Application servers like Express.js can act as lightweight reverse proxies, but they are less performant than dedicated proxies like Nginx. In production, Nginx is often deployed in front of Express.js to handle static files, load balancing, and security.

### Conclusion

Understanding the distinct roles of proxies, reverse proxies, and load balancers is essential for building secure and scalable web infrastructure. The video effectively clarifies these concepts, emphasizing that load balancing is just one feature of a reverse proxy and that a layered approach is often best.

## Transcript

largest websites handle millions of users simultaneously without crashing or how they transfer your data securely when directing you to the right server in this video we're going to dive into the three critical web components which
are proxies reverse proxies and load balancers whether you are an engineer or just curious about how the internet works behind the scenes in this video we will break down these complex Concepts in simple easy to understand terms so
let's get started imagine you were planning a dinner at a popular restaurant but you don't want to interact directly with the staff because you're too busy or too lazy or you're shy whatever the reason so instead you
have a personal assistant who makes the reservation on your behalf so the restaurant staff never interacts directly with you they only communicate with your assistant in this scenario you are the laptop that you use to browse
the internet and your personal assistant is a proxy server and proxy server acts as a middleman between your private Network which your laptop is connected to and the public internet where your requests go out and the proxy is
protecting your laptop by filtering traffic and blocking any harmful traffic and blocking any harmful websites or scripts or code before the response gets forwarded back to you now in a company scenario where this is more
important let's say you have many employees and they are browsing the internet and going on who knows what websites so for example if your marketing employee visits some shady website and clicks on a link to download
some new presentation tool in maybe a malicious website so they send some virus as a response along with the tool and when a malicious content or script penetrates your company internal Network through one employees computer it may do
some real damage to many other things in your company so to protect the internal Network an administrator in the company May configure all internet traffic of all employees machines to be routed through a proxy so proxy will now stand
as the guard of your company internal Network you can Blacklist any websites that you don't want any of your people to visit and proxy will block this traffic but for any other requests that actually do go out to the to various
websites it will also scan the responses for any viruses and of course block them if they are malicious so it acts as a shield between your private Network and the public internet plus it can also log
the public internet plus it can also log user activity to show what sites people are visiting and on top of that proxy also has another important feature which is caching responses so for example if one engineer in your company visits this
tutorial video about proxies to learn new skills the proxy will fetch that video from YouTube and cach it locally so now when 10 other Engineers see that
and decide they also want to watch such informative tutorial to learn new skills proxy will just return the cached copy instead of fetching it again from YouTube and this way it will save bandwidth and reduce any unnecessary
traffic to the internet and this kind of proxy is also called a forward proxy now back to our restaurant analogy your assistant made the reservation and you
arrive now what you do is instead of wandering around looking for a table yourself you check in at the reception desk right the receptionist tells you follow me and shows you to the right table so here the receptionist is also a
proxy but this time on a receiving end of the request it sits in front of the restaurant's internal dining areas which in our case are the servers and manages
the incoming requests or the guests and distributes them to the right Tables by checking the capacity and having overview of the entire flow and this proxy sitting on the server side handling those incoming requests from
clients is called a reverse proxy and the function of Distributing the guests evenly across dining areas and tables is load balancing which is one of the key
functionalities of a reverse proxy but it's not the only functionality reverse proxies actually have most of the features that the forward proxies have like acting as a shield to protect the servers because when you have hundreds
of servers and they all have access to sensitive data or code it's really dangerous to expose all hundred servers directly to the internet instead you protect them in an internal Network and you just put one or few proxy servers as
an entry point and you configure all the security measures on that handful of proxies so what the reverse proxies will do is they will scan the request they will ensure SSL encryption is enabled so the traffic is encrypted and will check
basically for any security threats or any attempts of hecking into your systems it also provides caching to speed up responses to the clients and has a logging functional for doing troubleshooting for example so a lot of
the features forward proxy has reverse proxy has as well and one of the most popular reverse proxies is engine X which you may already know as an engineer if not I actually have a separate video on enginex that you can
watch here so as you see load balancing is just one of the many functionalities of a reverse proxy so it's a feature that proxy can perform now many of you
may ask here but what about the cloud load balancers why do we need reverse proxy if we have cloudload balancers are they a replacement for reverse proxies
like ads and other Cloud platforms they all have load balancers so why do I need an engine X reverse proxy to load balance the incoming traffic if I can just use AWS load balancer well in practice you actually want to use both
and here is why for example you would have your Cloud load balancer outside of your servers as an entry point into your private Network while reverse proxy will
be routing traffic within your server Network so now you are encapsulating the reverse proxy and those backend servers all into a private Network and the load balancer basically just sits there and does a basic load balancing to the
reverse proxy and this type of layered approach actually makes your infrastructure much more secure and also much more scalable you may be asking why do I need to load balance twice on multiple levels so why do I need proxy
inside if I have the load balancing outside reverse proxy actually has more intelligent fine grained load balancing which will allow you to do much more intelligent routing to the web servers so while Cloud load balcers distribute
traffic based on simple algorithms like whoever is the least busy on on reverse proxy you can configure more advanced routing logic based on headers cookies or session data for example you can decide all the requests from the same
user they always go to the same web server so it will basically check the associated session data or cookies and it will forward the same client requests to the same server reverse proxy can also handle SSL and TLS termination and
you can inspect the encrypted traffic to make more informed load balancing decisions and this is especially important in microservices architecture where you may have plenty of microservices and based on the request
path for example or the URL you may want to forward that request to a specific micro service so it's a very logical load balancing that reverse proxy is doing here and in our restaurant scenario this would be equivalent to if
our receptionist for example knew some loyal guests and showed them to their favorite table to have dinner or they selected a table with the best view for guests who are celebrating a special occasion or giving a different menu for
vegetarian guests and so on so basically more customized request handlink based on a little bit more information about the guests and the setup that I that we would use in a kubernetes
cluster with microservices where an Ingress controller which is a basically reverse proxy for kubernetes will handle internal routing and security while the cloudload balancer will act as the first line of defense managing the external
traffic and kind of shielding them before they get to the cluster and finally another question you may be asking here especially if you are a software engineer is what about the servers or proxies that start
Java application what are those are those reverse proxies as well how do they run or how do they start in the background well these are lightweight proxies for example node.js it doesn't have a built-in reverse proxy
but you can easily create one using its HTTP module or a framework like expressjs which is actually a framework that most people use with noj so compared to engine X for example which is used in production prj serves
different purpose however these two can actually be used in combination so for comparison engine X is a high performance web server and reverse proxy so it's a technology that can be used for web server as well as reverse proxy
and it's ideal for serving static content has load balancing functionality it handles security features like SSL termination and so on while expressjs is a minimalist web framework for noj specifically used to build Dynamic web
applications and apis and you can actually configure some custom logic and middleware for how the request should be handled for different endpoints plus engine X also has an advantage that it can handle a large number of concurrent
connections very efficiently while expressjs is less performant in that area so in proper production setup engine X is often deployed in front of an exper application is a reverse proxy so in
this setup engine X will handle static files load balance requests and manage the security while expressjs will process the more Dynamic content so that's basically the breakdown of proxy versus reverse proxy as well as load
balancer which is pretty simple if you understand them at this basic level so I hope I was able to help you understand what these concepts are clearly and more importantly how they compare to each other which I think is probably the most
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