Simon Willison uses an interesting analogy to explain how Mastodon works. It’s like blogs. You can host your own or use a shared instance, and it also acts as a feed reader.
I sure hope that the rekindled interest in blogging won’t be stifled by everyone just moving from Twitter to Mastodon. Despite what everybody says, how different Mastodon feels, the parts I always hated about Twitter, the condensed hot takes optimised for likability and shareability and devoid of nuanced thinking — we would see that too on Mastodon once it takes off.