Search Engine Symbiosis
Search engines need to be relevant in the results of searches made on them, otherwise they will quickly go out of business. Searchers want the specific information they are looking for, and should they consistently come across irrelevant results, they will quickly substitute one search engine for another that produces these desired results.
Search engines therefore have to be strict and build in many factors to prevent people from making them irrelevant. These factors are known as Search Engine Algorithms. Webmasters and other SEO's regularly "crack" these algorithms, which lead to Search engines having to update algorithms plus introduce new ones on a constant basis. Failure to do so will result in manipulated results, again doing harm to a Search Engine.
In the end it comes down to a Symbiotic Relationship. If a website has good relevant content and stick by the "rules", the search engines will notice this and reward that site with what it deserves, namely high rankings. The site provides searchers with relevant information, thereby making the Search Engine relevant - a perfect symbiosis.
Search Engines have not concocted a wicket scheme to make life complicated for webmasters, but rather a solution against webmasters constantly trying to defraud the public and search engines. The ability of search engines to pick up on these fraudulent attempts, thereby making results as relevant as possible, is what distinguishes the top search search engines from the rest.
To summarize : The better content a site has, combined with a minimal amount of SE optimization, the better the symbiotic relationship that site will have with all the important search engines.
About the Author
( Brian is a freelance writer, website marketing and SEO expert & webmaster of 3 websites, including Rank Advance : http://www.rankadvance.com )