What is the difference between active open and passive open in a TCP socket?

Question

I learn the basics of networking and get confused about this. Anyone can explain the difference between two simple words.

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networking

Adarsh jayakumar Mar 29 '15 at 9:35

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2 answers

at least in simple words: passive opening on the side of the SERVICE (server or listener) active CLIENT (source or initiate

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Jim stock Mar 12 '19 at 16:20

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user207421 · Accepted Answer · 2015-03-29T22:54:45+0000

Passive opening is the creation of a listening socket to receive incoming connections. It uses socket(), bind(), listen(), followed by an accept() loop.
An active discovery is to create a connection to the listening port by the client. It uses socket() and connect() .