The Backspace Key is a key found on computer keyboards that allows users to delete text or characters to the left of the cursor. When pressed, it removes the character immediately before the cursor's position, making it easier to correct mistakes while typing. This key is commonly used in word processing applications and text editors. In addition to its primary function, the Backspace Key can also be used in web browsers to navigate back to the previous page. However, this feature may vary depending on the browser and its settings, so users should be aware of its different functionalities across applications.