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A laptop computer or notebook computer, also known as a laptop or notebook, is a small, portable personal computer (PC). Laptops typically have a clamshell form factor with a flat-panel screen on the inside of the upper lid and an alphanumeric keyboard and pointing device on the inside of the lower lid.
The Epson HX-20 from 1982 was the first portable computer to be called a "notebook".. The terms laptop and notebook both trace their origins to the early 1980s, coined to describe portable computers in a size class smaller than the contemporary mainstream units (so-called "luggables") but larger than pocket computers.
A human computer, with microscope and calculator, 1952. It was not until the mid-20th century that the word acquired its modern definition; according to the Oxford English Dictionary, the first known use of the word computer was in a different sense, in a 1613 book called The Yong Mans Gleanings by the English writer Richard Brathwait: "I haue [] read the truest computer of Times, and the best ...
Some models of laptop computers have a detachable keyboard, which allows the system to be configured as a touch-screen tablet. They are sometimes called 2-in-1 detachable laptops or tablet-laptop hybrids. [39] Mobile phones are designed to have an extended battery life and light weight, while having less functionality than larger computers.
Threads have their own thread ID, program counter (PC), a register set, and a stack, but share code, heap data, and other resources with other threads of the same process. [87] [88] Thus, there is less overhead to create a thread than a new process. [89] On single-CPU systems, concurrency is switching between processes.
An ultra-mobile PC, [1] or ultra-mobile personal computer (UMPC), is a miniature version of a pen computer, a class of laptop whose specifications were launched by Microsoft and Intel in Spring 2006. Sony had already made a first attempt in this direction in 2004 with its Vaio U series , which was only sold in Asia.
An ultra mobile PC is a full-featured, PDA-sized computer running a general-purpose operating system. Phones , tablets : a slate tablet is shaped like a paper notebook. Smartphones are the same devices as tablets, however, the only difference with smartphones is that they are much smaller and pocketable.
Sizes of classic subnotebooks (2001's ThinkPad s30, 10.4") and early netbooks (2008's Eee PC 901, 8.9"); note to reduced keycaps size. As typical laptop sizes have decreased over the course of the 2010s, and other distinguishing features have become mainstream, the distinction between regular-size and 'subnotebook' laptops has largely disappeared.