The word 'niche' actually relates to a indent or cavity in a surface or place of storage. A niche is also a recess for display of art or sculpture. Common usage now more commonly relates it to a fit place for a person, a person's skills or activity. It can also relate to a social fit into a group, or matching a person or business with a market.
Examples of Niche:
|That's a nice niche you've carved out for yourself in the local football community.|
He's finally found his niche in life, as an artist.
Finding your own professional niche is always worth doing.