niche: an opportunity to sell a particular product to a particular group of people (产品的)商机;市场定位

They spotted a niche in the market, with no serious competition. 他们看到市场上一个竞争不激烈的商机.

a niche market 有利可图的市场

the development of niche marketing(= aiming products at particular groups) 针对某群体的产品营销开发