Rebooting is used for sort if promoting the person who originally posted the blog.
Once you reblog a blog you can not undo it,
Although the ability to remove a reblog from your posts will be available soon on a future update for Steemit.
Keep in mind rebloging can help the person you reblogged from get more followers and more Likes as well it can help yourself as well.
This post was just explaining what rebooting is used for since some people didn't fully know why rebloging was a thing.
(If you haven't already followed go ahead do that now and I will be following to people who follow in the next 24 hours, Upvote this blog if it helped you understand why/and how rebloging works)