client-server systems are having clients and server which processes some kind of data
The client–server model of technology is a distributed application structure that segmentation tasks or workloads between the providers of a service, called servers, and service requester, called clients.Client/server model can be used by programs within a individual computer, it is a more essential concept for networking. In this case, the client set up a connection to the server over a local area network (LAN) or wide-area network (WAN), such as the Internet.