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

• A passive open is the creation of a listening socket, to accept incoming connections. It uses socket(), bind(), listen(), followed by an accept() loop.
• An active open is the creation of a connection to a listening port by a client. It uses socket() and connect().

at least in simple terms: passive open is on the SERVICE (server or listener) side active is the CLIENT (source or initiat