For a web search engine, the retrieval of data is a combine activity of the crawler (or spider or robot), the database, and the search algorithm. These three elements work in concert to retrieve the word or phrase that a user enters into the search engine’s user interface.
Rankings play such an important role in search engine optimization. However different search engines use different ranking criteria but you need to know some basics and potential causes that could enhance or alter your search engine rankings.
Location doesn’t refer here to the location (as in the URL) of a web page. Instead, it refers to the location of key words and phrases on a web page. So, for example, if a user searches for “puppies,” some search engines will rank the results according to where on the page the word “puppies” appears.
Obviously, the higher the word appears on the page, the higher the rank might be. So a web site that contains the word “puppies” in the title tag will likely appear higher than a web site that is about puppies but does not contain the word in the title tag. What this means is that a web site that’s not designed with SEO in mind will likely not rank where you would expect it to rank. The site www.puppies.com is a good example of this. In a Google search, it appears ranked fifth rather than first, potentially because it does not contain the key word in the title tag.
The frequency with which the search term appears on the page may also affect how a page is ranked in search results. So, for example, on a page about puppies, one that uses the word five times might be ranked higher than one that uses the word only two or three times. When word frequency became a factor, some web site designers began using hidden words hundreds of times on pages, trying to artificially boost their page rankings. Most search engines now recognize this as keyword spamming and ignore or even refuse to list pages that use this technique.
One of the more recent ranking factors is the type and number of links on a web page. Links that come into the site, links that lead out of the site, and links within the site are all taken into consideration. It would follow, then, that the more links you have on your page or leading to your page the higher your rank would be, right?
Again, it doesn’t necessarily work that way. More accurately, the number of relevant links coming into your page, versus the number of relevant links within the page, versus the number of relevant links leading off the page will have a bearing on the rank that your page gets in the search results.
One last element that might determine how your site ranks against others in a search is the number of click-throughs your site has versus click-throughs for other pages that are shown in page rankings. Because the search engine cannot monitor site traffic for every site on the Web, some monitor the number of clicks each search result receives. The rankings may then be repositioned in a future search, based on this interaction with the users.
Therefore, if you are considering any seo task for boosting your search engine ranking then you might consider all this before paying attention to buying some paid high PR pages, as the method above could help you considerably in increasing your rankings then the bought PR links.