An orange is an in English. When an English word starts with a consonant phoneme, it uses a, and when the following words start with a vowel phoneme, it uses an. Because the first sound before orange is a vowel phoneme, it is necessary to add an. English belongs to the West Germanic branch of the Germanic family of Indo-European languages. It was first used by Britain in the Middle Ages and became the most widely used language in the world because of its vast colonies. The Anglo tribe, the ancestor of the British people, is one of the Germanic tribes that later migrated to the island of Great Britain, called England. English is the most popular language in terms of distribution area, but the number of native speakers is the third in the world, second only to Chinese and Spanish.