There are a few ways. The first is to look at the leaves. If they are large and round with a nice strong aroma, that's probably cilantro. The second is to look at the stems. They should be green and fibrous. There's not much to look at for basil. The third is to look at the seeds. If the seeds are small and hard, that's probably cilantro.
The herb cilantro (Coriandrum sativum) has become ubiquitous in the American kitchen. It is used as an ingredient in everything from salad dressings and marinades to soups, stir-fries, chili, sauces, and even desserts.
If it's not the fresh, familiar herb that adds so much flavor to soups and stews, it may be the dried spice known as coriander. It's a member of the parsley family, and it's often called "the other cilantro" because it's hard to find fresh cilantro and easier to find dried coriander.