See the current Perl documentation for socket.

Here is our local, out-dated (pre-5.6) version:

socket - create a socket


Opens a socket of the specified kind and attaches it to filehandle SOCKET. DOMAIN, TYPE, and PROTOCOL are specified the same as for the system call of the same name. You should `` use Socket;'' first to get the proper definitions imported. See the example in Sockets: Client/Server Communication.