Basically, Google includes three main parts that includes a Google Bot, indexer and a query processor. Google bots, a search engine spider retrieves thousands of pages simultaneously and provide the information to the indexer. It crawls over the web and search for the particular pages and it also considers the add URL form. The Google bots add the fetched pages into the queue of the indexer. But, these bots are in the need to overcome some spamming problems like duplicate contents, cloaking, hidden text, domain spam, hidden links, typo spams. Bots are programmed in a such a way to differentiate the automated codes.
The Google index database stores the datas collected by the bots. Alphabetically sorted index helps in easy retrieval. The task of the query processor is to evaluate the queries and matching the verified documents. After successful evaluation, the pages are ranked based on the position of pages in page rank data structure.
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