What exactly is a Branch ?

A branch is where a user shares your post, it increases your exposure but you split the profits. If someone likes your post you make BSV, if someone likes a branch of your post you still make BSV but you split the profits with the person who branched it.

so something like a retweet

It’s similar to a retweet except you get paid when someone branches and whenever someone interacts with the branch (but so does the person who branches it).

Part of a tree, in a forest, surrounding the world. This
https://twetch.app/t/dc7029a286f178eea1d5bf3d314865544f9f09b30011741fe498384537ee5998

I had the same confusion. Also had little experience with Twitter. A branch brings up the post to all yr followers to see.