Fantasy sports are online games where participants create their own teams made up of real-life athletes from various professional leagues, such as the NFL or NBA. Players earn points based on the actual performance of these athletes in games, making it a fun way to engage with sports while testing your skills in strategy and management. Participants often join leagues with friends or strangers, competing for the best scores throughout a season. The excitement comes from drafting players, making trades, and setting lineups each week, all while following the real games closely to see how their fantasy teams perform.