Google Now on Tap was a feature introduced by Google that allowed users to access contextual information from their mobile devices. By simply pressing and holding the home button, users could get relevant information based on what was currently displayed on their screen, such as text, images, or apps. This feature aimed to enhance user experience by providing quick access to related content, such as web pages, music, or nearby places. It integrated seamlessly with other Google services, making it easier for users to find answers and discover new information without needing to type or search manually.