An oven is a tool which is used to expose materials to a hot environment. Ovens contain a hollow chamber and provide a means of heating the chamber in a controlled way. In use since antiquity, they have been used to accomplish a wide variety of tasks requiring controlled heating. Because they are used for a variety of purposes, there are many different types of ovens. These types differ depending on their intended purpose and based upon how they generate heat.
A double oven
A ceramic oven
Oven depicted in Jean-François Millet's painting, Woman Baking Bread (1854)
Ancient Greek portable oven, 17th century BC
Human food is food which is fit for human consumption, and which humans willingly eat. Food is a basic necessity of life, and humans typically seek food out as an instinctual response to hunger; however, not all things that are edible constitute as human food.
Display of various foods
Yogurt in a steel vessel
Salt mounds in Bolivia
Typical Balinese cuisine in Indonesia