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> It links up addresses to host names so that you don’t have to remember ip addresses of servers.

Um.

Just imagine that DNS doesn't exist. Or hosts files. Or `~/.ssh/config`...

Well I can imagine working in a cheapo shop where you cannot have public technical domain or setting up DNS is "too much to spend on".

But hostfile well if you have to share it with 2-3 other people might be a hassle?

That's why ssh config allows setting up alias names for servers.