Why did kryptonians come to earth?

In the comic books in the late 1930s, all Kryptonians were superhuman and possessed super powers. In the subsequent version, kryptonians can only gain superpowers if they come to the earth to absorb the energy of yellow sunlight.

On krypton, it is a red sun galaxy, and krypton lives as normal as the earth (technology is more developed than the earth). The earth revolves around the yellow sun, and the yellow sun reacts with Superman's cells. Superman has hot eyes, frozen breath, flying, super powers, perspective, steel body and so on. Similarly, zod, who came to the earth, is also super powerful, and his setting is stronger than Superman. And Superman's Kara has the same ability.

Kryptonians come from DC comics and movies. In the DC universe, they are indigenous to Krypton, and their representative is Superman.

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Kryptonian