About

A socket in the context of TCP.

A TCP socket is a session identifier for each TCP connection and is the combination of:

• a local address:
  • source host address,
  • source port,
• a remote address
  • destination host address,
  • and destination port.

It's used interchangeability with the term TCP connection as one connection is equal to one socket.

The output of netstat showing a socket Id with its state.

Adress

In tcp, a socket address is the combination of

• an IP address
• and a port number.