In Apex Legends, a config file is a file that can be edited to change various settings in the game. These settings can include things like keybindings, graphics settings, and other options that can affect gameplay. Config files can be used to customize the game to a players preferences, but they can also be used to cheat. Some players use config files to gain an unfair advantage in the game, such as by increasing their field of view or reducing recoil on weapons. However, cheating is against the games terms of service and can result in a ban. There are many tutorials available online that explain how to set up and use config files in Apex Legends.