The "End Task" feature is a function found in the Task Manager of Windows operating systems. It allows users to terminate unresponsive applications or processes that may be slowing down the computer or causing issues. By selecting a task and clicking "End Task," users can free up system resources and restore normal functionality. This feature is particularly useful when an application freezes or crashes, preventing users from closing it through standard methods. It provides a straightforward way to manage running programs and maintain optimal performance on a computer.