What is the meaning of centre of gravity and centroid?

Center of gravity: Have you ever heard someone say that one of the advantages of being short and stocky is that you're less likely to get knocked over? They might have even mentioned that it's because the short and stocky person has a lower center of gravity. The center of gravity (CG) of an object is the point at which weight is evenly dispersed and all sides are in balance. A human's center of gravity can change as he takes on different positions, but in many other objects, it's a fixed location. Centroid: In mathematics and physics, the centroid or geometric center of a plane figure is the arithmetic mean (average) position of all the points in the shape. The definition extends to any object in n-dimensional space. Centroid is the mean position of all the points in all of the coordinate directions. Informally, it is the point at which an infinitesimally thin cutout of the shape could be perfectly balanced on the tip of a pin.

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