FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Directories are human powered search engines. A website is submitted to the directory and must be approved for inclusion by editorial staff.

Detailed explanation-2: -The first type of search service is called a directory, and a directory uses human editors to manually place web sites or web pages into specific categories. A directory is commonly called a “human-based” search engine.

Detailed explanation-3: -Essentially it means a search engine which can, and will have its results (or at least the position of its results) affected by human intervention, usually by people rating individual results further up or further down the rankings.