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Wiktionary
server-side

a. (context computing Internet English) Occurring on the server (remote machine) rather than the client (local machine). alt. (context computing Internet English) Occurring on the server (remote machine) rather than the client (local machine).

Wikipedia
Server-side

Server-side (commonly referred to as SS) refers to operations that are performed by the server in a client–server relationship in a computer network.

Typically, a server is a computer 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 behavior 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 lightens the work of your client. This also protects your SAMP server from crackers.

Examples of server-side processing include the creation & adaptation of a database using MySQL.

Usage examples of "server-side".

ASP files are the common file type used by Microsoft's IIS and Active Server to perform server-side processing.