Which type of celestial body is a comet primarily classified as?

Comets are primarily classified as icy bodies because they are composed mostly of ice, dust, and rocky material. When comets approach the sun, the heat causes the ice to vaporize, creating a glowing coma and a tail that extends away from the sun. This distinctive feature is what sets comets apart from other celestial bodies, such as asteroids, which are largely rocky and metallic, or planets and stars, which have different fundamental properties and structures. The icy composition of comets is crucial since it is this aspect that leads to their characteristic appearance and behavior in the solar system.