Contextual relevancy is the term used to describe the search engine optimization techniques used within your web site to maximize relevancy. Copy, Images, Titles, Descriptions, Headings, Directory structure configuration and naming, and w3c code validation are all parts of contextual relevancy.
The SEO process always begins with contextual relevancy, which is then revisited throughout the rest of the SEO Process to continually maximize relevancy for new or expanded Keyword phrases. Contextual relevancy can be loosely summed up in the term Keyword Density – or how often your keywords appear within your website.
Community relevancy happens outside your website.