Organic search results are listings on search engine results pages that appear because of their relevance to the search terms, as opposed to their being adverts. In contrast, non-organic search results may include pay per click advertising.
The Google, Yahoo!, and Bing search engines combine advertising and search results on their search results pages. In each [...]

SEO techniques can be classified into two broad categories: techniques that search engines recommend as part of good design, and those techniques of which search engines do not approve. The search engines attempt to minimize the effect of the latter, among them spamdexing. Some industry commentators have classified these methods, and the practitioners who employ [...]

Getting indexed
The leading search engines, such as Google and Yahoo!, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. Some search engines, notably Yahoo!, operate a paid submission service that guarantee crawling for [...]