What is the difference between fish and cats?

Fish and cats are both vertebrate animals, but they belong to different classes: fish are aquatic vertebrates belonging to the class Actinopterygii, while cats are terrestrial mammals belonging to the class Mammalia. Fish typically have scales, gills for breathing underwater, and fins for swimming, while cats have fur, lungs for breathing air, and claws for hunting. Additionally, fish reproduce by laying eggs, while cats give birth to live young.