Community relevancy is the term used to describe the search engine optimization techniques employed externally from your website. This primarily consists of building Link Popularity: assembling links to your website using your Keywords as Anchor Text, through paid inclusion, promotion, and various forms of reciprocal link exchange.
Search engines determine the relevancy of your web site in part by the relevancy passed from web sites that link to yours. i.e. A Link to â€œScottsdale Real Estate Broker” from Realtor.com passes huge amounts of relevancy to the target website, as Realtor.com is an established and trusted source of real estate information.
Contextual relevancy happens within your site.