A subnotebook is a small and lightweight laptop. Synonyms include "ultraportable" and "minilaptop". The term "ultra-mobile PC" ("UMPC") is also used, although this is the name of a platform of small form-factor tablet PCs (see UMPC).

They generally are found to run full desktop operating systems such as Windows or GNU/Linux, rather than specialized software such as Windows CE, Palm OS or Internet Tablet OS.

Subnotebooks are smaller than laptops but larger than handheld computers. They often have smaller-sized screens, usually measuring from 7 inches (17.7 cm) to 13.3 inches (33.78 cm), and a weight from less than 1 kg (2.2 lbs) up to about 2 kg (4.4 lbs)[citation needed]. The savings in size and weight are usually achieved partly by omitting ports or having removable media or optical disc drives. Many can be paired with docking stations to compensate.

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