The chili pepper, or more simply just "chili", is the fruit of species of the plant Capsicum from the nightshade family, Solanaceae.The name, which is spelled differently in many regions (chili, chile or chilli), comes from Nahuatl via the Spanish word chile. The term chili in most of the world refers exclusively to the smaller, hot types of capsicum. The mild larger types are called bell pepper in the USA, simply pepper in Britain and Ireland, capsicum in Australasia and paprika in many European countries.Chili peppers have been a part of the human diet in the Americas since at least 7500 BC and perhaps earlier. There is archaeological evidence at sites located in southwestern Ecuador that chili peppers were already well domesticated more than 6000 years ago, and is one of the first cultivated crops in the Americas.