A laptop computer or simply laptop (also notebook computer or notebook) is a small mobile computer, typically with a weight of one to three kilograms, depending on size, materials, and other factors.
While the terms "laptop" and "notebook" are often used interchangeably, "laptop" is an older term, introduced in 1983 with the Gavilan SC. "Notebook" is a later coinage, which was used to differentiate smaller devices like the Compaq LTE series in 1989, whichwere, in contrast to previous laptops, is about the size of an A4 sheet of paper. [1] Either term is often misused: by heat and other issues, many laptops are not suitable for use on your lap, and most are not the size of an A4 sheet. Although, some older portable computers, such as the Macintosh Portable and certain Zenith SPort Turbo models, sometimes called "laptop" means, their size and weight were too great for this category.