What is AF_INET, and why do I need it?

I’m getting started on socket programming, and I keep seeing this AF_INET.

Yet, I’ve never seen anything else used in its place. My lecturers are not that helpful and just say “You just need it”.

So my questions:

  • What is the purpose of AF_INET?
  • Is anything else ever used instead of it?
    • If not, why is it there? For possible changes in the future?
    • If so, what and why?

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