struct sockaddr {
    unsigned short sa_family;   // address family, AF_xxx
    char           sa_data[14]; // 14 bytes of protocol address
};

In this structure what exactly is the meaning address family depicted by sa_family?

Does it mean that protocols like TCP/UDP have "addresses"? Well, the protocols can be identification numbers not addresses, I think.

Anyway, if yes, then on what basis have their families been divided?

sockets network-programming network-protocols
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