Ultrabook vs. Laptop — What's the Difference?

Ultrabook is a marketing term, originated and trademarked by Intel, for a category of high-end laptop computers. They were originally marketed as featuring ultra thin form factor and light weight design without compromising battery life or performance, and when the term was originated they generally were enough smaller than average laptop models to qualify as subnotebooks.

A laptop, laptop computer, or notebook computer is a small, portable personal computer (PC) with a screen and alphanumeric keyboard. These typically have a "clamshell" form factor, typically having the screen mounted on the inside of the upper lid and the keyboard on the inside of the lower lid, although 2-in-1 PCs with a detachable keyboard are often marketed as laptops or as having a "laptop mode." Laptops are folded shut for transportation, and thus are suitable for mobile use.

(computing) A very lightweight and thin portable computer the areal size of a notebook computer or subnotebook.

A portable computer with a display screen hinged to a keyboard, small enough to use on one's lap.

(computing) A laptop computer.

A portable computer small enough to use in your lap