The Sun is classified as a G-type main-sequence star, often referred to as a yellow dwarf star. More specifically, its spectral type is G2V, indicating it is a main-sequence star with a surface temperature of about 5,800 K (approximately 5,000 to 6,000 K) and a yellowish color

. Key points about the Sun as a star:

• It is about 4.5 to 4.6 billion years old

• It is a hot, glowing ball of hydrogen and helium undergoing nuclear fusion in its core, where hydrogen fuses into helium, producing energy

• The Sun is the central star of our solar system, and its gravity holds the system together

• As a main-sequence star, it is in a stable phase of its life, fusing hydrogen in its core, which is typical for about 90% of stars in the universe

• Yellow dwarf stars like the Sun make up around 7% of the stars in the Milky Way galaxy

In summary, the Sun is a G2V type star, a yellow dwarf, and a main-sequence star, characterized by its moderate temperature, yellow color, and stable hydrogen fusion process in its core.