a job or position that is very suitable for someone, especially one that they like

He has carved/made a niche for himself as a financial advisor. 他成为了财务顾问，为自己找到了合适的发展方向。

an area or position that is exactly suitable for a small group of the same type

an ecological niche 生态龛

a hollow in a wall, especially one made to put a statue (= artistic object) in so that it can be seen