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