Why is hump important for camel?

Also known as the ship of the desert, camels can live without food and water for days together. This is the reason why camels have been used for travelling in desert since times immemorial. Before starting a long journey, a camel takes in large quantities of water and food. the water is stored in water pouches in its stomach, while the food is stored as fat in its hump. It is because of this hump that a camel can survive in the dry and harsh desert. All these days, the camel's body survives on this reserved fat and provides energy to the animal. after a long journey, the hump gets loosened. The camel rests for a long time; has its intake of food and water and sets out for another journey.