In the universe of Star Trek, Andoria is the homeworld of the Andorians, a race of white-haired, blue-skinned, antennaed aliens.
Andoria is a moon of a large, ringed gas giant called Andor, located in a star system adjacent to Vulcan. Andoria is cold and icy, and the Andorians live in massive underground cities where they can be close to geothermal sources of warmth and energy. Andoria has a nitrogen/oxygen atmosphere which is breathable to humans.
Andoria is famous for the Andorian Academy of Art, which is the most prestigious art school in the Federation, and the Andorian Mountains are noted for their austere beauty and are a well-known honeymoon destination for people from across the Federation.