A computer is a machine that manipulates data according to a list of instructions. The first devices that resemble modern computers date to the mid-20th century (1940–1945), although the computer concept and various machines similar to computers existed earlier. Early electronic computers were...

The All-New CompUSA.com has more Computers, Laptops, Televisions, Software, Electronics than ever before!

Formerly known as Gateway 2000. Popular desktop and notebook computers. Order from their web sit...

Official Hewlett-Packard site - Buy or learn about HP printers, laptops, computers, digital cameras, servers, storage, networking, software, enterprise solutions and more.

Information and sales of notebooks, desktop computers, servers, printers, software, and suppor...

Apple designs and creates iPod and iTunes, Mac laptop and desktop computers, the OS X operating system, and the revolutionary iPhone.

Newegg - Computer hardware and software, consumer electronics, and communications product superstore offering the widest product selection of IT brands and CE brands.

Wholesale suppliers of refurbished and factory remanufactured computers.

Newegg - Computer hardware and software, consumer electronics, and communications product superstore offering the widest product selection of IT brands and CE brands.

Includes lessons on computer types, input/output devices, storage, applications, and operating systems. Also explains how to avoid computer-related health problems.