A Web Crawler is a program that browses the worldwide web in a typically arranged, ordered and mechanized manner. A web crawler is also popularly known as a web spider or ant.
Web crawlers create a copy of all the frequently visit sites. The copies are further used by search engine. The search engine indexes the [...]

Searching through an index involves a user building a query and finally submitting it through the search engine.
The query can be any thing from a simple and a single word to a couple of words together.
Complex queries involve the help of Boolean operators. Boolean operators allow the users to filter and extend the terms of [...]

It is essential for a search engine to store the information in a useful manner as soon as the spider finds information on web pages.
The accumulated data can be made accessible to the users by including too key components.
a) The information stored with the data.
b) The method by which the information is indexed.
A search engine [...]