What does the backspace key do?

The backspace key is specifically designed to remove the last character typed in a text document. When you press the backspace key, it deletes the character located immediately before the cursor's current position, allowing for quick corrections without needing to retype the text. This function is essential for editing, as it helps users to efficiently manage typographical errors while typing.

In contrast, clearing the entire line, moving the cursor to the left, or inserting a space are functionalities associated with other keys. The backspace key does not fulfill those roles; instead, it concentrates on modifying the text by deleting characters one at a time, making it a fundamental tool for anyone engaged in keyboarding tasks.