Even though they can be difficult to use and frequently result in many false drops, for many topics they are essential. However, be prepared to sift through many inconsequential pages to find what you want. Resources found are placed in the search engine's databases which are made available for searching by the user.
Users can connect to a search engine site and enter keywords to query the index.
The best matches, whether Web pages or other Internet resources, are then returned as hits. Search engines vary according to the size of the index, the frequency of updating the index, the search options, the speed of returning a result set, the result set presentation, the relevancy of the items included in a result set, and the overall ease of use. It is important to remember that most resources on the Internet are not subject indexed at all like the resources listed in a card catalog. The library cataloger spends much time and energy selecting the perfect few words that describe the resource and using the same words in a consistent manner. When a search engine selects a page based on a keyword request, it does not pay attention to how the word is used on that page.