This document discusses different types of computers including desktop PCs, laptops, handheld/palmtop computers, smartphones, and tablet PCs. Desktop PCs are non-portable computers designed for use on an office desk, while laptops are portable computers that can be used anywhere. Handheld/palmtop computers are pocket-sized devices with limited functionality. Smartphones combine mobile phone and computing capabilities. Tablet PCs are mobile computers that can be operated with a digital pen or touchscreen.