What is "progressive disclosure" in a topic?

Because each topic has a title and short description in addition to its full content, applications can provide progressive disclosure. For example, a user can hover over a link to see its short description and then decide whether to follow the link for the rest of the topic. Progressive disclosure also allows topics to be meaningfully browsed in a variety of viewing contexts, whether full-screen browsers, integrated help panes, infopops, or PDA screens. The application can disclose as much information as the context supports, letting the user decide where and how to drill down to more content.

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