Yams are a good source of vitamin C – 27% of the daily value for fighting infections such as colds and flu and quick wound healing, anti-aging, strong bones, and healthy immune function. It also provides good amounts of fiber, potassium, manganese, and metabolic B vitamins.Yams are carbohydrate rich, staple tuber vegetables of West African origin. Botanically it belong to the family Dioscoreaceae, in the genus, Dioscorea.There exist several hundred cultivars of Dioscorea; however, only a few of them worth of commercial importance. Popular yam tuber types grown are Dioscorea rotundata (white guinea), alata (yellow). bulbifera (aerial potato). opposita (Chinese). esculenta (Southeast Asian) and D. dumenterum (trifoliate).