I keep seeing ppl on here who are starting sub. What exactly is it and what does it do? Is it to help get off of drugs?

Suboxone is used for opiate addiction. There are a limited number of doctors that are able to prescribe it and they are usually psychiatrists or addiction specialists. It is a very strong narcotic that does not allow you to feel an opiate high but keeps your opiate receptors happy with the intent of keeping opiate cravings at bay.

There is a ton of information on Suboxone here if you want to search some of the older threads.