These other computer systems are referred to as computer clients. They include desktops, laptops, smartphones, smart devices like TVs, etc. Client computers connect to servers via the internet or via LAN (local zone network).
Similar to other machines, servers are made up of various parts that assist them in their work that include motherboards, CPU (central processor), RAM for processing memoryand hard disks used for data storage, power supplies as well as a network connection that is physical.
The difference between servers and client computers is that they can be utilized in any space, servers have specialized spaces, known as server rooms in which these servers are stored. Server racks are situated in clean, air-conditioned spaces.
A server receives requests from client computers via the internet. Servers are able to receive requests and transmit details to the clients. This is referred to as the request-response model. An example of this is when a user clicks their computer for an email to be opened. A request is then sent to the server, and it transmits the response that, in this example, will result in by opening the email.