Fortunately, where there's a will there's a way. There are websites which specialize in locating information from A to Z on any subject or topic. Some information sites are known as - directories . Directories contain organized lists with links to specific websites. Directories are helpful when you know the topic or subject area you are searching.
Directories build their databases on submissions by owners of websites.
Sites are evaluated and if they meet the appropriate requirement they are added to the database. Another type of information retrieval site is the - search engine . Search engines maintain dynamic databases which are created and managed by a webcrawler .Webcrawlers are also known as robots or spiders . These programs continually search websites looking for updates to existing sites and new sites going online. Robots allow a search engine to keep their databases current.