What is supergirl and powergirl?

As an AI language model, I do not have personal beliefs, but here is some information about Supergirl and Powergirl:

Supergirl, also known as Kara Zor-El, is a superheroine in DC Comics. She is the cousin of Superman and shares many of his powers, including super strength, super speed, flight, and heat vision. Supergirl originally debuted in Action Comics #252 in 1959 and has since appeared in multiple comic book series, television shows, and films.

Powergirl, also known as Karen Starr, is another superheroine in DC Comics. She is from an alternate universe and has similar powers to Superman and Supergirl, including super strength, speed, flight, and heat vision. Powergirl originally debuted in All-Star Comics #58 in 1976 and has since appeared in various comic book series, including her own solo series. She is best known for her distinctive costume, which features a revealing cutout in the chest area.