Why does node.js need https module? How is it different from http?

Question

Node.js

Previously, I used only the http module, do I understand correctly that the https module should only be used when the domain uses an ssl certificate? What does it do then and why doesn't http fit?
It's also interesting about http2, maybe someone has already used it, does it have any advantages over regular http? Maybe in speed?

Answer 1

security. https has an ssl certificate. A secure connection has some sites that can't teach api's, for example, because a secure connection is needed. Let's say such as a telegram bot