App Inventor is a visual programming tool developed by MIT that allows users to create mobile applications for Android devices without needing extensive coding knowledge. It uses a drag-and-drop interface, enabling users to design their app's layout and functionality by connecting blocks that represent different programming elements. This platform is particularly popular in educational settings, as it encourages creativity and problem-solving skills among students. With App Inventor, users can build a variety of apps, from simple games to more complex applications, making it accessible for beginners and experienced developers alike.