AutoHotkey is a free scripting tool that allows users to automate tasks by sending keyboard and mouse inputs. It has features for creating hotkeys, macros, GUI automation, and more. The document discusses how the author uses AutoHotkey scripts for tasks like launching applications, navigating windows, and automating data entry. Specific examples are provided for creating hotstrings and scripts to open work items from a ticketing system with keyboard shortcuts. In conclusion, the author finds AutoHotkey useful for creating lightweight applications and automating tasks.