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