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The form of the traditional laptop computer is a clamshell, with a screen on one of its inner sides and a keyboard on the opposite, facing the screen.It can be easily folded to conserve space while traveling.The first laptops using the flip form factor appeared in the early 1980s.The Dulmont Magnum was released in Australia in 1981–82, but was not marketed internationally until 1984–85.As portable computers evolved into the modern laptop, they became widely used for a variety of purposes.The terms laptop and notebook are used interchangeably to describe a portable computer in English, although in some parts of the world one or the other may be preferred.

Since the introduction of portable computers during late 1970s, their form has changed significantly, spawning a variety of visually and technologically differing subclasses.

Most modern laptops feature integrated webcams and built-in microphones, while many also have touchscreens.

Laptops can be powered either from an internal battery or by an external power supply from an AC adapter.

Subnotebooks are usually smaller and lighter than standard laptops, weighing between 0.8 and 2 kg (2-5 lb), Since the introduction of netbooks and ultrabooks, the line between subnotebooks and either category has blurred.

Netbooks are a more basic and cheap type of subnotebook, and while some ultrabooks have a screen size too large to qualify as subnotebooks, certain ultrabooks fit in the subnotebook category.