The keyboard shortcut "Ctrl + W" is commonly used in various software applications to close the current window or tab. This function is particularly useful in web browsers like Google Chrome or Mozilla Firefox, where it allows users to quickly close a tab without navigating through menus. In addition to web browsers, "Ctrl + W" is also applicable in programs like Microsoft Word and Adobe Photoshop, where it can close the active document or workspace. This shortcut enhances productivity by streamlining the process of managing multiple open files or tabs.