The H-R diagram shows relationship between a star's absolute magnitude and its?

The H-R diagram (Hertzsprung-Russell diagram) illustrates the relationship between a star's absolute magnitude (luminosity) and its surface temperature (or color). It categorizes stars into different groups such as main sequence stars, giants, and white dwarfs, highlighting their evolutionary stages. The diagram reveals that hotter stars are generally more luminous, while cooler stars tend to be dimmer. This relationship helps astronomers understand stellar evolution and the characteristics of different types of stars.