What are symmetrical composition and balanced composition? What are the obvious characteristics of the two forms of composition in artistic expression?

Balance type: the main body is not placed in the middle independently, but separated from top to bottom, left and right, so that each part can give people a sense of balance, just like the trays at both ends of the balance.

Symmetry: the main body is generally in the middle, and there is a feeling that horizontal or vertical lines can divide the main body into two halves.