Red-giant branch

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What Wikipedia says

The red-giant branch (RGB), sometimes called the first giant branch, is the portion of the giant branch before helium ignition occurs in the course of stellar evolution. It is a stage that follows the main sequence for low- to intermediate-mass stars.

Excerpt from the Wikipedia article “Red-giant branch”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Lithopsian, CC BY-SA 4.0, via Wikimedia Commons.