B-type stars are a class of hot, luminous stars that have surface temperatures ranging from about 10,000 to 30,000 Kelvin. They are typically blue in color and are much more massive than the Sun, often exceeding two to three times its mass. B-type stars are known for their strong stellar winds and rapid rotation, which can lead to the formation of nebulae around them. These stars are often found in young star clusters and play a crucial role in the evolution of galaxies. Their intense radiation can influence the surrounding environment, contributing to the formation of new stars. Examples of B-type stars include Sirius B and Altair.