Hello there!
Lemmy is a federated social platform. What does this mean for me? It means that you could be on any instance, and talk to most other instances.
What is an instance? An instance of lemmy is just a single individual lemmy server. You can host your own on a VPS if you want!
An instance is a single copy of the software running on a single physical or virtual server. If you run two copies of the software on the same physical or virtual server, that counts as two instances.
https://www.nginx.com/Resources
I am on lemmy.antemeridiem.xyz, and I am able to interact with you, a lemmy.blahaj.zone user, on lemmy.blahaj.zone!
This is the power of a federated community!