What is the defining characteristic of a concave pentagon?

Answer

It possesses at least one vertex pointing inward, causing one interior angle to exceed $180^{\circ}$

A concave pentagon is identified by having at least one vertex directed inward, which necessitates that one interior angle measures greater than $180^{\circ}$.

What is the defining characteristic of a concave pentagon?
Geometryshapepentagonpolygonregular