A "Tab" or "Label" is a user interface element commonly found in software applications and websites. It allows users to navigate between different sections or categories of content without leaving the current page. Tabs are often displayed as clickable buttons or links, making it easy to switch between various views or settings. Tabs help organize information in a clear and accessible manner, enhancing user experience. They are frequently used in applications like web browsers, file management systems, and spreadsheet software, allowing users to manage multiple documents or datasets efficiently.