答案:During the 1990s, the numbers of people using the internet doubled annually. Fueling the medium’s growth was the increasing popularity and affordability of personal computers and the growing use of modems, which allowed computers to access the internet via an ordinary phone line. The 1990s also introduced people to a particular part of the internet known then as the World Wide Web (WWW). The web, as its name implies, was a distributed network of content providers and users, communicating through a protocol known as HTML, or HyperText Markup Language. HTML allowed for the relatively easy creation of displays, called web pages, that link to all kinds of content, including other web pages or sites (and, later, photographs, movies, databases, sound files, etc.). Viewing web pages was made easy by the development of web browsers, software that interpreted HTML (and later other code that permitted greater interactivity, such as Javascript, PhP, and Flash).