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. An example of drilling down to a niche market
- search marketing, privacy considerations, legal issues, history of, future of, different types of vertical search, etc.
- search engine optimization, search engine advertising
- link building, keyword research, reputation monitoring and management, viral marketing, SEO copywriting, Google AdWords, information architecture, etc.