Can someone explain what is dynamic DNS and how it works? or What is dynamic DNS and why would I need

yo thanks everyone! didn’t realize my router had DDNS built in—just set up No-IP and it’s working great.

one follow-up: does DDNS slow things down at all? or is it just a background thing that does its job silently?

also, any tips for picking a good hostname? or just go with whatever lol.