Onion is an important vegetable which plays a vital role in everyday cooking not only in India but also every part of the world. It belongs to the Allium family of plants, which also includes chives, garlic and leaks. Usually there are three types of onions, yellow, red and white. Onions are commonly used while cooking other vegetables, which will increase the taste of these vegetables. Onion tastes differently when it is added to different types of food dishes. It???s also eaten raw or used as salad with different food dishes. Onions are not only rich in their nutritional values but also have amazing properties to cure or protect from various diseases. Onions are loaded with multiple vitamins minerals and anti-oxidants. Onions have great positive effects on several different aspects of health; moreover onions are very rich in their nutritional value. They are high in vitamins, minerals, and antioxidants while being low in calories. One cup of chopped onion provides calories14.9 grams (g) of carbohydrate, 0.16 g of fat, 0 g of cholesterol, 2.72 g of fiber, 6.78 g of sugar and 1.76 g of protein Onions also contain small amounts of calcium, iron, folate, magnesium, phosphorus, potassium, the antioxidants, quercetin and sulfur. Onions are powered with vitamin C, B6, Phytonutrients, and a wallop of antioxidants including flavonoids – quercetin and sulphuric compound allicin. Its rich antioxidant profile makes this wonder bulb efficient in protecting cancer. Use of onions regulates the blood sugar, lowers the blood pressure, reduces the aging process, helps to make the skin and hair glowing and healthy, and helps to regulate the sleep disorders etc