Homologous organs – these are the organs where the basic structural composition, design and origin are similar but differ in the functions they perform. These structures develop in related entities and exhibit divergent evolution. For instance, forelimbs of man and frog apparently have the same basic design of bones but carry out different functions.
Analogous organs, on the other hand, are the organs possessing a different basic structural design but they are similar in the functions they carry out. These structures develop in unrelated entities and exhibit convergent evolution. For instance, even though the wings of bats and bird look similar, wings of bats have skin foldings whereas the wings of birds are covered with fur.