Stars are categorized by their color based on their surface temperature. Here are the main categories and their approximate temperature ranges:

* Blue: 25,000-50,000 K (44,540-89,540 °F)

* Blue-White: 10,000-25,000 K (17,540-44,540 °F)

* White: 7,500-10,000 K (13,540-17,540 °F)

* Yellow-White: 6,000-7,500 K (10,340-13,540 °F)

* Yellow: 5,200-6,000 K (9,030-10,340 °F)

* Orange: 3,500-5,200 K (6,030-9,030 °F)

* Red: 2,500-3,500 K (4,030-6,030 °F)

It's worth noting that these are just broad categories and the colors of stars can vary within each category.