@mattblaze@LauraPhillips99 Not just Mastodon. It's #DevOps speak, since in this day and age we don't always run an OS by itself on "bare metal" hardware. We usually use virtual machines and containers. "Instance" is just a generalization of "Server".
@mattblaze@LauraPhillips99 👍 The idea is straightforward: you can run Windows and Mac OS on your Linux box. Or any other combination. There's performance restrictions. Most of the internet works this way, now.