This encyclopedia focuses on computers and issues related to computers. More than 400 entries, arranged alphabetically, provide information on hardware, software, computer languages, operating systems, applications, the Internet, key individuals, and social issues such as the digital divide. With a limited number of entries, topic selection appears based on popularity. For example, Microsoft Windows gets a three-page main entry, while the Macintosh operating system is only mentioned within articles related to Macintosh (e.g., Jobs, Steven Paul).