Your Rocket.Chat version: Most current

I am looking at using the RocketChat API as documented here: https://rocket.chat/docs/developer-guides/rest-api/

I had 2 questions:

1. This document references both "channels" and "rooms" are channels and rooms the same thing?
   ex: "Join a room" vs. "Create a channel"
2. I see a channel creation endpoint (http://localhost:3000/api/v1/channels.create) when this creates a channel I believe it is public. Is it possible to pass a flag to make channels private when they are created via the API?