Niche

Business / Search Engine Optimization (SEO) / Niche: A topic or subject which a website is focused on. Search is a broad field, but as you drill down each niche consists of many smaller niches. Generally it is easier to compete in small, new, or underdeveloped niches than trying to dominate large verticals. As your brand and authority grow you can go after bigger markets.
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Other Words for Niche

Niche Adjective Synonyms: recess, hollow, alcove, nook
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Ecological Niche

Science / Biology / Ecological Niche: The role an organism occupies and the function it performs in an ecosystem; closely associated with feeding. MORE

Niche Overlap

Science / Biology / Niche Overlap: The extent to which two species require similar resources; specifies the strength of the competition between the two species. MORE

Affiliate Marketing

Business / Internet Marketing / Affiliate Marketing: Revenue sharing between online advertisers/merchants and online publishers/salespeople, whereby compensation is based on performance measures, typically in the form of sales, clicks, registrations, or MORE