A server is a computer program or device that accepts and responds to requests made by another program, known as a client.
A good comparison is a customer (client) who orders a packaged which is delivered by the postman (server).
Servers are used by software applications and website to manage network resources including to control access to a network, e-mail services, host a website or store large amounts of data securely for quick access as required.
Some of the most common server types are:
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