A notebook computer (also known as a laptop or laptop computer) is a portable computer that has a screen and an alphanumeric keyboard. The clamshell design of laptops is typically a clamshell with the screen on the inner side of the lid and the keyboard inside the lower lid. However, 2-in-1 computers with detachable keyboards are often called laptops or “laptop mode“. Laptops can be folded down for transport and are therefore suitable for mobile usage. Because they can be placed on the lap of a person when in use, they are named so. Laptops are widely used today in many settings.