Tablet computer is a kind of mobile computer with touch screen display, which is usually color, processing circuit and rechargeable battery, and adopts thin and flat package. Most tablets also have sensors, including digital cameras, microphones and accelerometers, so images on the screen are always displayed vertically. Touch screen displays use finger or stylus gestures instead of the mouse, touchpad, and keyboard used in laptops.

Tablets are larger than smartphones or personal digital assistants, and the diagonal size of the screen is 7 inches (18 cm) or more. But many of the tablet's features are similar to those of a modern smartphone, using a virtual keyboard and running a mobile operating system.

Laptops can be classified according to the presence and appearance of keyboards. Tablets and brochures do not have a physical keyboard and typically use a virtual keyboard displayed on a touchscreen enabled display to accept text and other input. Hybrid, convertible and 2-in-1 all have physical keyboards (although these keyboards are usually hidden or removable), but they also use virtual keyboards. Some 2-in-1 processors have processors and operating systems, such as complete laptops, and the flexibility to be used as tablets. Most tablets can use a separate keyboard connected via Bluetooth.

The format was conceptualized in the middle of the 20th century (Stanley Kubrick described the fictional tablet computer in his 1968 science fiction film 2001: a space odyssey), and was prototyped and developed in the last two decades of the century. In April 2010, Apple released the iPad, the first popular tablet. Since then, in the 2010's, tablet computers have gained popularity and become a large product category for personal and workplace applications.

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