A niche market is a focused, targetable portion (subset) of a market sector.

By definition, then, a business that focuses on a niche market is addressing a need for a product or service that is not being addressed by mainstream providers. A niche market may be thought of as a narrowly defined group of potential customers.

Niche marketing is the process of finding and serving small but potentially profitable market segments and designing custom-made products or services for them. For big companies those market segments are often too small in order to serve them profitably as they often lack economies of scale. Niche marketers are often reliant on the loyalty business model to maintain a profitable volume of sales.