Region lock in games refers to a feature that restricts access to a game or game content based on the player's geographic location, often due to legal or licensing requirements or to maintain a fair playing field. It can prevent players from accessing certain games or content that are only available in certain regions, and can also prevent players from accessing servers or content from other regions where they may have an unfair advantage. However, it can also be a controversial feature as some players may feel unfairly excluded due to their location.