1.
niche, specialized, narrow market
A small, specialized segment of a market or area of interest that caters to a specific group. Also used as a na-adjective meaning highly specialized or appealing to a narrow audience.
Usage
Commonly used in business and marketing to describe a small, specialized market segment. In casual conversation, ニッチな〜 describes something with a narrow, specialized appeal — a hobby, interest, or topic that few people know about.