Question

In a minimum of two sentences, define a red giant and how a red giant forms.

Answer 1

Answer:

Red giants are stars currently in the later phase of Stellar evolution. A red giant is formed when a star has expended its hydrogen fuel, expanded, and begins fusing helium in its core.

Explanation:

Answer 2

Red Giants are the stars that currently in the late phase of the Stellar Revolution. One of the main features of a red giant is its variations on brightness.
Red Giants are formed because of the constant helium-burning process from the stars (which keep making it bigger and bigger) to the point where it almost ran out of it.