I see you are new here. You might want to check this out:
https://steemit.com/dustsweeper/@dustsweeper/dustsweeper-faq
Steemit has a system where if your post does not get enough upvote value, you will not get paid for that post. But if you use dustsweeper, it will use the Steem you send it to upvote your post to the right value, so you won't lose your "dust votes".