What is the primary use of the "Tab" key?

The primary use of the "Tab" key is to insert spaces for indentation, which is crucial for formatting documents correctly. When you press the "Tab" key, it typically moves the cursor a preset number of spaces to the right, creating a visual separation in text. This is particularly useful in word processing applications for aligning text, creating structured lists, or emphasizing sections through indentation. Proper indentation increases the readability of a document, making it easier for readers to follow the structure and organization of the content.

In contrast to this primary function, the other options serve different purposes that do not align with the main role of the "Tab" key. For instance, deleting individual characters is performed with the backspace or delete keys, moving the cursor to the next line is achieved by pressing the "Enter" key, and saving the document is done using the "Save" command or a keyboard shortcut like Ctrl + S. Understanding the precise function of the "Tab" key is essential for effective keyboarding and document formatting skills.