How do gifts work in relation to bits?

So I have a good amount of bits saved up from watching Ad’s. I think I have an understanding on how to use bits on emotes in chat to support the streamer I’m watching. Idk how me giving them bit emotes helps them but they seem happy when someone gives them an emote with some bits attached. So I could use an explanation on that. Also I see that it says if i spend 200 bits I will get 3 gifts. What are these gifts? Are they the unlockable emotes for the month? Also do I have to spend 200 at once or will I get the 3 gifts once I reach a total of 200 bits spent. I’d just like to know before I start spending my bits.

This is covered in this Blog Post

Additionally, your question is not relevant to this forum, which is third party support.