Niche marketing is one of the most commonly used terms in online marketing. It refers to a number of different processes, all focused on a specific market subset. Basically, a niche is a small segment of the market, focused only on a single type of product or service. This is the reason why niche websites have a targeted base of customers, which makes them interesting to the merchants selling the product/service that falls into that niches category. However, as soon as a niche proves to be profitable, a number of marketers will start exploiting it, thus reducing the slice of the profit pie each competitor gets. That is why the key to success in niche marketing is finding the niche thats profitable, yet still under the radar of most marketers.