“Server-side” refers to processes that occur on a server (In a server-client relationship) rather than a client machine. In most cases, the process works like this: A client machine connects to a server requesting information, the server runs a process, then the information is sent to the client machine. This is different from “Client-side”, which is where the information is sent to the client machine, which then processes the information. On the web, the client refers to the machine you use to connect to websites, while the server refers to the machine that stores the website.