Before you eat any corn, you need to remove and discard the husk and silky strings. After the ears of corn are cleaned off, wash them under cool running water in the sink to remove and clinging dirt. It is best not to husk your corn until right before cooking it.
However, you can cook ears of corn with or without the husk removed. If boiling them in a pot of water, the husks are removed before the ears are submerged. Often when cooked on a grill, the husks are removed prior to grilling.
If cooking the corn in a campfire or roasted in an oven, the husks might be left on. However, it is a good idea to peel back the husk and remove the silky tufts, then reposition the husks back around the ear of corn.