HORIZONTAL NAVIGATION
The search engines also offer other types of navigation elements. Via clicking on navigation element you can manipulate the search result content like Image,Video,News etc..
SEARCH QUERY BOX
All of the engines show the query you’ve performed and allow you to edit that query or enter a new query from the search results page.
RESULT INFORMATION
This section provides a small amount of meta information about the results that you’re viewing, including an estimate of the number of pages relevant to that particular query.And it also provide in how many seconds search engine find that no. of pages
QUERY REFINEMENT SUGGESTION
Query refinements are offered by Google, Bing, and Yahoo!. The goal of these links is to let users search with a more specific and possibly more relevant query that will satisfy their intent.
VERTICAL NAVIGATION
Each engine offers the option to search different verticals, such as images, news, video, or maps. Following these links will result in a query with a more limited index.
PPC ADVERTISING
Companies purchase text ads from either Google AdWords or Microsoft adCenter. The results are ordered by a variety of factors, including relevance (for which CLICK-THROUGH-RATE, use of searched keywords in the ad, and relevance of the landing page are factors in Google) and bid amount (the ads require a maximum bid, which is then compared against other advertisers’ bids).
NATURAL/ORGANIC/ALGORITHMIC RESULT
These results are pulled from the search engines’ primary Indexes of the Web and ranked in order of relevance and popularity according to their complex algorithms.
References:The Art of SEO BOOK
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