There is no difference between yams and potatoes.
Potato is also known as yam egg, yam, yam, yam, yam, fragrant yam, yam, yam, yam, yam, yang yam, ground egg, potatoes and so on. Belong to the Solanaceae, annual herbaceous plants, tubers are edible, is the world's fourth most important food crops, second only to wheat, rice and corn. Containing a large amount of starch, can provide the body with rich calories, and rich in protein, amino acids and a variety of vitamins and minerals.
Expanded Information:
p>In the 17th century, the potato had already become an important food crop in Europe and had already spread to China, where it had been introduced only three hundred years earlier. It is said to have been introduced by overseas Chinese from Southeast Asia, and in the 21st century China's potato planting area ranks second in the world. The potato is highly productive, nutritious and highly adaptable to the environment.
It is now found all over the world, and can be cultivated in tropical and subtropical countries even in the winter or cooler seasons to achieve higher yields. Because the potato is well suited to grow in the original very low grain production, can only grow oat (naked oat) in the alpine region, soon popularized in Inner Mongolia, Hebei, Shanxi, northern Shaanxi.
Baidu Encyclopedia - Potato