The keyboard shortcut "Ctrl + A" is commonly used in computer applications to select all text or items within a document or window. When you press these keys simultaneously, it highlights everything in the active area, making it easier to copy, cut, or format the selected content. This function is available in most software, including word processors like Microsoft Word and web browsers. Using "Ctrl + A" can save time, especially when dealing with large amounts of data or text. Instead of manually clicking and dragging to select, this shortcut allows users to quickly highlight everything, streamlining tasks such as editing or organizing files in Windows Explorer.