A tablet computer, or simply tablet, is a mobile computer with display, circuitry and battery in a single unit. Tablets are often equipped with sensors, including cameras, microphone, accelerometer and touchscreen, with finger or stylus gestures replacing computer mouse and keyboard. Tablets may include physical buttons, e.g., to control basic features such as speaker volume and power and ports for network communications and to charge the battery. An on-screen, popup virtual keyboard is usually used for typing. Tablets are typically larger than smart phones or personal digital assistants at 7 inches (18cm) or larger, measured diagonally.

Display Resolution:

The display resolution of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT), Flat panel display which includes Liquid crystal displays, or projection displays using fixed picture-element (pixel) arrays.

It is usually quoted as ‘width x height’, with the units in pixels: for example, “1024 x 768” means the width is 1024 pixels and the height is 768 pixels. This example would normally be spoken as “ten twenty-four by seven sixty-eight” or “ten twenty-four by seven six eight”.

Display Size:

On two-dimensional display devices such as computer monitors and television sets, the display size (or viewable image size or VIS) is the actual amount of screen space that is available to display a picture, video or working space, without obstruction from the case or other aspects of the unit’s design. The viewable image size (often measured in inches or millimeters) is sometimes called the ‘physical image size’, to distinguish it from the ‘logical image size’ (display resolution, measured in pixels) of various computer display standards.
Desktop  Laptop
Mobile Device (smartphone)