Have you heard people on the Fediverse talk about instances, but not sure what they are?
✅ Your instance is the site you signed up on, for example FediTips is on the instance https://mstdn.social. There are thousands of independent Fediverse instances, but they talk to each other through a process called federation. Together they have millions of users. Each instance has its own administrator and own rules.
Instances are also sometimes called servers or communities.