From July through late September, corn is king. You’ll find this fresh, sweet treat at every grocery store and farmers market, and on restaurant and home menus alike. That said, not all corn is created equal—and since you’re eating so much of the stuff, you might as well educate yourself a little on this prized summer vegetable (that’s also sometimes a grain). Indeed, there’s much to know and our guide to the main types of corn is a good place to start. Read on for a rundown, complete with chef-