LinuxQuestions.org - Socket structure

Hello all im trying to make sence of some example code for dealing with socket programming.

here is the code

Code:

  struct sockaddr_in {

        short int          sin_family;  // Address family

        unsigned short int sin_port;    // Port number

        struct in_addr    sin_addr;    // Internet address

        unsigned char      sin_zero[8]; // Same size as struct sockaddr

    };

ok well i get that this is a basic structure. What i dont get is the struct in the structure.

is it defined out side of this structure. Sorry my nested structure is a little rusty so if the answer is obvious please dont kill me. :)