Link popularity is defined by Wikipedia as a measure of the quantity and quality of other web sites that link to a specific site on the World Wide Web. It is an example of the move by search engines towards off-the-page-criteria to determine quality content. In theory, off-the-page-criteria adds the aspect of impartiality to search engine rankings.
Link popularity is one of the most important aspects of a search engine ranking algorithms. In fact, link popularity has become increasingly important for achieving top search engine visibility. Link popularity tells the search engine how many web sites are linking to your web site, which gives a really good indication of how popular or important your site is. If the back links to your website are coming from a website which is similar or relevant to your website then it has more weight as compared to a back link from a general website/category.
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Backlinks are defined by Wikipedia as incoming links to a website or web page. The number of backlinks is an indication of the popularity or importance of that website or page. In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or top level domain) from another web node.
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Keyword density identified by Wikipedia as the percentage of words on a web page that match a specified set of keywords. In the context of search engine optimization keyword density can be used as a factor in determining whether a web page is relevant to a specified keyword or keyword phrase. Due to the ease of managing keyword density, search engines usually implement other measures of relevancy to prevent unscrupulous webmasters from creating search spam through practices such as keyword stuffing.
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Other sections to come:
Broken Links
Misspelled Words
HTML Validation
Load Time Analysis
Meta Tag Optimization
Image Optimization
Search Engine Inclusion
Keyword Analysis