Indexing is simply the work the Search Engine Robots do to give you information on enterprise car rental. How does an indexing robot decide what to index? Well they just send their Bots or Spiders to crawl the web looking for enterprise car rental on web sites.
If an indexing robot finds a document that contains enterprise car rental, it may decide to parse it, and insert it into its database. How this is done depends on the robot. Some robots index the HTML Titles that contain enterprise car rental and keep them in their database. Others will look for enterprise car rental in the first few paragraphs, or parse the entire HTML and index all words.
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