https://dev.to/ajayv1/learn-nginx-and-its-basics-in-2022-4ddb
Nginx is a short form of *engine x* is an HTTP and reverse proxy server. It is heavily used as a load balancer and serves static files, sometimes even complete static websites like the company’s blog hosted on Nginx!.
In simple terms, the Load balancer is like a middle man sitting in between the concerned parties e.g assume A is the list of clients and B is the list of the servers then —
All incoming requests would be going to just one server which in the worst case, makes it hang or crash. You probably have heard the term *Node API or Service API is down* which means the box or the server serving that API request is hung or crashed due to request overload or OutOfMemory etc. Thus making the UX unresponsive.
All incoming requests will have to go through the Load Balancer. It maintains the routing table and gets notification if any of the boxes or server goes down (through polling).
It efficiently distributes the network requests across servers and if one server goes down it redirects the requests to others servers that are online. Thus, maintaining the availability of the server always online.