Laptop is a portable computer. The laptop computers also known as notebook computers. The assembly of laptop parts are more difficult compared to desktop, hence the cost of laptops are expensive than desktops. Laptops are very thin in size, and weight would be less than 3 pounds that are easily carriable and occupy less space. Some of the popular manufacturers of the laptops are Toshiba, HCL, Apple, Compaq, HP, Dell and many more. One of the additional features of laptop is in-built battery backup. So it can help continuing work until you save. The laptops are runoff with AC power or with battery.