The apple is an edible fruit produced by the apple tree. Apple trees are farmed worldwide and are the most widely cultivated species of the Malus genus. Visually speaking, the apple is a round fruit with a firm and juicy pulp. There are green, yellow, and red apples. The apple is one of the most consumed fruits in the world. Its popularity is due to the fact that it is available throughout the year. It is a fruit rich in pectin and vitamins, and is a great source of antioxidants. The apple stimulates the immune system and fights against the appearance of certain diseases.