Topical Search Results at Google?

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At one point in time, search engines such as Google learned about topics on the Web from sources such as Yahoo! and the Open Directory Project, which provided categories of sites, within directories that people could skim through to find something that they might be interested in.

Those listings of categories included hierarchical topics and subtopics; but they were managed by human beings and both directories have closed down.

In addition to learning about categories and topics from such places, search engines used to use such sources to do focused crawls of the web, to make sure that they were indexing as wide a range of topics as they could.

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