Question

Why is our sun also a star?

Answer 1

It's already a star from the beginning. Sun is the name of our star.

Explanation:

Our sun, with a solar flare.

Answer 2

It fulfills the requirements to be called a star.

Explanation:

Stars are space objects that produces their own energy through fusion reaction of gasses. They are like round, gas burning, energy producing luminous orbs.
Sun- the star of our solar system is a star because it produces energy by the fusion reaction of Helium turning into Hydrogen.