Symmetry axes are imaginary lines that divide a shape or object into two identical halves. When a shape is reflected across this line, both halves match perfectly. For example, a butterfly has a vertical symmetry axis that runs down its center, allowing both wings to mirror each other. In geometry, symmetry axes help classify shapes and understand their properties. Regular polygons, like squares and triangles, have multiple symmetry axes. The more axes a shape has, the more symmetrical it is considered. This concept is essential in various fields, including art, architecture, and biology, where symmetry plays a significant role.