Unlike traditional sports betting, fantasy sports are generally viewed as "games of skill," rather than "games of chance," thus exempting them from gambling bans and regulations in many jurisdictions.
DFS is similar to traditional fantasy sports but condensed into one day or night. Sites like DraftKings and FanDuel take a portion of the total entry fees as commission (known as the rake ), but unlike sports gambling, you are competing against other players and not the House.