Yes.
Each week if you watch a player burst on the scene or an opportunty opens up to to a benching or injury or whatnot, you can make a claim before Wednesday and the player with the worst record and point total gets first choice. It helps bad teams rebuild by giving them first dibs each week since they get the highest priority. That's called waivers.
Or right now, after waivers, you can get anyone that hasn't been dropped during waivers. It's called first come/ first serve waivers.