The Web has existed only for about 17 years, but it has already become one of the major information sources both in our professional and everyday lives. The number of pages and sites on the Web is growing constantly.

The size of the Web was estimated, as of 2005, to be 11.5 billion web pages. This estimate is already outdated, and it only measures the “Indexable Web,” which excludes the so-called “Deep Web,” mainly data retrieved from databases and presented to the web user in dynamic, momentarily existing web pages. The Deep Web was estimated to be at least 450 times larger than the Indexable Web.

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