A Laptop is a computer to carry anywhere in the world.It was invented by Bill Moggridge in 1969 .This is also known as notebook pc.It is mostly intended for mobile use. It combines the most typical desktop PC components, including displays, keyboards, pointing devices such as touchpad.. The laptop is running on a network using the AC adapter, and can be used with access to the use of batteries. laptop batteries in the new conditions typically stores enough energy to run a laptop from four to five hours depending on computer usage, configuration and power management settings. When the laptop is connected to the network, the battery recharges whether the laptop is in running condition. PROS AND CONS OF LAPTOP:- 1.Portability:-It is very easy to carry anywhere you like to go. 2. Size and Weight: Laptops are condensed. 3. Battery:-To manage the laptop for 4 to 5hours backup depending upon the laptop configuration. 4.multiplex system:-It combines everything keyboard,mouse,speakers,peripheral devices etc. Cons;- 1.cost is more when compare to desktop PC’S. 2.upgradation is cumbersome because each manufacturer follows their own design ideas. 3.prolonged use of laptops causing possibilities of strain injury. 4.dust enty into the laptop is very easy.life of the battery is also limited. SOME OF THE LAPTOP MANUFACTURERS:- 1. Acer 2. Apple 3. Dell, 4. Hewlett-Packard 5. Lenovo: 6. Samsung 7. sony.