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They are called instances. One instance can have multiple servers as backup.
Example: An instance can have a server in New York State and California, if the New York server caught fire, they can redirect you to the California backup server.
And one server can host multiple instances đź‘Ť
That too, but I hope we aren't doing that since one fire would take out multiple instances.
So servers are sort of batteries for instances/websites, right?
Youre right. "Servers" are just computers that do all the work behind a website.
But when it comes to lemmy people sometimes use "server" and "instance" to refer to the same thing: what lemmy.ml, lemmy.world, and others are.
Which, let's be honest, is not the case with most instances... not trolling, just saying 🤷.
That kinda sucks, but my point was to clarify the terminology, not claiming that some Lemmy instances have multiple servers.