AF INET
Berkeley sockets (or BSD sockets) is a computing library with an application programming interface (API) for internet sockets and Unix domain sockets, used for inter-process communication (IPC).
As the API has evolved with little modification from a de facto standard into part of the POSIX specification, POSIX sockets are basically Berkeley sockets.
Read more about AF INET: History, Implementations, C and Other Programming Languages, Alternatives, Header Files, Socket API Functions, Protocol and Address Families, Options For Sockets, Blocking vs. Non-blocking Mode, Terminating Sockets, Client-server Example Using TCP, Client-server Example Using UDP