A fantasy sport is a virtual sports game where participants create virtual teams that consist of 'real' players. The fantasy players pick names from franchise-based sports leagues and competitions or international teams and get rewarded based on the actual, on-ground performances of their selected sports players.
Fantasy sports or daily fantasy games are different from other electronic game genres and are categorised as a 'game of skill' as the participants who play them tend to have some sporting acumen to pick their teams. They do so based on form, past track record, player-vs-player stats and various other factors. They make calculated judgements for their teams and aren't solely dependent on luck.
Participants can play in private leagues with their friends as well as global leagues which pit them against all registered players for a particular tournament. Rewards in fantasy gaming can range from cash prizes and merchandise to flaunting your predictive sporting powers over your friends.