An AHK file is a script created with AutoHotkey. It is saved in a plain text format and contain lines of code that are executed by the AutoHotkey program.

AutoHotkey is a Windows scripting program used for automating common or repetitive tasks. It can be used to create complex scripts or simple macros. AutoHotkey scripts may also contain hotkeys and hotstrings, which are used for keyboard shortcuts and string replacements.