A tablet personal computer (tablet PC) is a pocket computer equipped with a touch screen for input, and running an OS such as android or iOS. Tablet PC screen size is usually in the range of 7" up to 11". After 11 inches, it usually comes into small size laptop and hardly fit your packet. Lower than 7inches, smart phones are popular. The article describes the components of a tablet PC, advantages and disadvantages, and how it compares with laptop and smart phones.