Stellar properties refer to the characteristics that define stars, including their temperature, brightness, size, and composition. These properties help astronomers classify stars into different types, such as main sequence, giants, and dwarfs. The temperature of a star is often measured using its color, with hotter stars appearing blue and cooler stars appearing red. Another important aspect of stellar properties is luminosity, which indicates how much light a star emits. This is influenced by both the star's size and temperature. Additionally, the chemical composition of a star, including elements like hydrogen and helium, provides insights into its age and formation history.