There are two main types of oranges: sweet and bitter. The scientific name of the sweet orange is Citrus sinensis, and the scientific name of the bitter orange is Citrus aurantium.
Oranges are some of the most commonly cultivated fruit in the world. Modern oranges count as a hybrid fruit, and it is believed that they were created by crossbreeding pomelos and mandarins, both of which have been cultivated since ancient times. They grow largely in subtropical environments, and the fruit can be eaten as it is or processed into juice. Oranges come in a large number of varieties, including Valencia, Belladonna, Caderna and Homosassa.