The Elo Rating system is a method used to calculate the relative skill levels of players in two-player games, such as chess. Named after its creator, Arpad Elo, the system assigns a numerical rating to each player based on their performance in matches. When a player wins, their rating increases, while the opponent's rating decreases. The amount of change depends on the players' current ratings and the match outcome. This system allows for a dynamic ranking of players, making it easier to compare skill levels across different competitions. The Elo Rating is widely used in various games and sports, including chess, tennis, and video games, providing a standardized way to assess player performance.