Lichess is a free, open-source online chess platform that allows players to play chess games against others from around the world. It offers various game modes, including bullet, blitz, and classical chess, as well as puzzles and training tools to improve skills. The platform is accessible on both desktop and mobile devices, making it easy for users to play anytime, anywhere. Lichess also features a strong community, with options for tournaments, analysis of games, and the ability to watch live games played by top players.