Typically, a server is a software program, such as a web server, that runs on a remote server, reachable from a user's local computer or workstation. Operations may be performed server-side because they require access to information or functionality that is not available on the client, or require typical behaviour that is unreliable when it is done client-side.
Server-side operations also include processing and storage of data from a client to a server, which can be viewed by a group of clients. Advantage: This enlightens the work of your client.
Examples of server-side processing include the creation & adaptation of a database using MySQL