Client

A client is a process that basically requests data from a server. As we're talking about the web, the browsers are clients requesting HTML pages from servers.

Server

Process providing service/data for a client

Client / Server Model

Clients requesting data from servers

Note: A piece of code/machine/software can be both server and client at the same time because it could act as a client requesting data from a database and serving a service as a server.

We've been used to associate Clients to Frontend and Servers to Backend

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About the codebase executing on the client and the server:

Client

• End-users can see all of the code (Browsers)
• Need to be fast
• Low computing power (depends on the end-user)
• Cannot access Database directly (you can store information in the Browser, but in this case, we need information/data shared across users)

Server

• Hidden code and implementation details
• Slow (compared to clients because we need to wait on the network)
• Scalable computing power (💰💰💰💰💰)
• Can access Database easily and share information across users