Although the terms are often used interchangeably in America, they are two different vegetables. Sweet potatoes are a starchy tuber native to the Americas that is distantly related to a potato. Sweet potatoes in the US come in two varieties: one with a creamy, white interior and the other with an orange interior.
There are 118 calories in 100 grams of Yam. Get full nutrition facts and other common serving sizes of Yam including 1 oz and 1 cup of cubed.