Oranges are classified into two categories: sour and sweet. Sour oranges, such bergamot and Seville, are typically not eaten because they are very bitter. They are commonly used to make products such as perfume, liqueur, and marmalade, according to this University of Arizona Cooperative Extension publication. Sweet oranges are typically eaten fresh or juiced. There are many popular types, including navel, Valencia, and blood oranges, which also have their own sub-varieties:
Parent Washington: This variety of navel orange is extremely popular and likely to be what you pick up when you see an orange simply labeled “navel orange” at the store, according to The University of Arizona Cooperative Extension. Like other navel oranges, Washington parent oranges are deliciously sweet, easy to peel, and seedless.