1. Server is software programme however clients is just an computer application such web browser
2. Server runs on remote server while client runs on users local computer.
3. multiple users can log in at the same time in a server while client is more end user software i.e single user generally can access.
4. Client means action take on users computer however in server action takes place on web server side
Client: A client is a piece of computer hardware and software that accesses a service made available by a server. for example, web browsers are clients that connect to web servers and retrieve web pages for display.
Server: A server is a computer program or a device that provides functionality for other programs or devices, called clients.
Client-Server: when you are using your laptop or PC which is connected to internet, when you type website address then computer sends out a request to a server on the network so this would be the request here and the server is going to look at your request and see if it's valid request or and if it can fulfill this is a very critical part if you send an invalid request which cannot be fulfilled of course you are going to get an error that could be 404 page not found so the server is going to look at it and if it can fulfill it when it's going to respond with the request of webpage then it's going to send you the webpage to your computer. In this scenerio you making the request & you are declined which needs some information or has a request, the computer on the network which fulfills your request is the server.
it's very simple analogy, for example someone calling you up on the phone and asking you to pick them up from someplace that person is client and you serving them with some sort of service you are the server. whole internet is based on this analogy.