it's marketing niche products to niche markets. a niche is defined as a distinct segment of a market. A niche could be weight loss. A subniche of that niche could be weight loss for women who have just given birth.
Actually isn't niche that "weight loss for women who have just given birth" and "weight loss" itself is just the one huge area where you are finding different niches. Or that's how I see it
It is where you pick a niche or topic like Dogs for instance, and become the authority of that "niche". Take for instance my niche is list building for profits. I have in place this site: http://www.listbuilding-101.com that I gear towards sending SEO, Web 2.0, PPC, blog, and forum traffic to. It pays for itself with the Google Adsense and helps establish a relationship with those seeking list building info and links to my money making programs like my membership site http://www.listmastersecrets.com I also offer a list building resource that is also a profit building membership site http://www.trafficpro-x.com On top of that, I use squeeze (Opt-in list to build subscribers) pages for various other traffic methods including traffic exchanges and safelists and in return lead those people to my niche membership sites. I will continue to build and promote list building membership sites, reports, e-courses, and more until I conquer that niche. While using every form of traffic available to brand that I am an authority of list building. I just detailed the reason why I was able to quit my day job up above, I hope it helps some people.
If anyone has any questions about what I stated above I would be more than happy to answer your questions.