Comment by Mev-Rael on "Can you explain about socket-function in your own way (easy-to-understand way)?"

Network socket is a core of the Internet communication. Socket is a link between request (client) and response (server) on lowest level provided you by the machine/OS.

Sockets are associated with specific combination of:

IP address and port (server and client addresses)
and Protocol (Standard, set of rules, describing how exactly machines should understand, encode/decode each other messages)

You open a socket over network when you want to establish a connection, then you receive some data from the server and, depending on protocol (like HTTP), you decode it or use a ready library.

socket() and similar functions in all programming languages are similar to fopen(), they return you a pointer you use in other functions to send/receive data through this already established connection.

Image from difference between socket programming and Http programming

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