Believe it or not, wild rice is actually unrelated to rice. It is the seed of a specific aquatic grass that is commonly found growing in rivers in parts of Northern America.
You've probably noticed that it is typically quite a lot more expensive than other varieties of rice, which is because of the fact that there are only 4 varieties of wild rice, compared to thousands of varieties of white rice, so it's not as common. It's also nowhere near as easy to cultivate.
Wild rice has a distinctive flavour which is more earthy and nutty than white rice. It is also chewier in texture. You'll be happy to hear that it's also arguably a healthier choice as well - being higher in protein than white rice, and a little lower in calories.