In what way homologous organs give evidence for evolution?

Homologous organs are the organs that have the same internal structure but perform different functions to survive in the prevailing environment. They give strong evidence for evolution. They represent a case of divergent evolution.

For example, the forelimbs of human, frog and lizard possess the same internal structure but perform different functions. This indicates that they have evolved from a common ancestral animal and have the same origin.