A Padfone is a hybrid device developed by Asus that combines a smartphone with a tablet dock. The smartphone can be inserted into the tablet's body, allowing users to utilize the tablet's larger screen while retaining the smartphone's functionality and processing power. This design aims to offer the convenience of both devices in one integrated system, making it easier for users to switch between mobile and tablet experiences. The Padfone concept emphasizes versatility and portability in mobile technology.