Things that are fried are cooked in very hot fat or oil. You can order fried rice at a Chinese restaurant, or fried clams at your favorite seafood place.
Some foods are lightly stir fried, while others are submerged in boiling oil and deep fried. At a state fair, there are offerings including fried dough and fried chicken, and it's even possible to eat fried candy bars or fried ice cream. Colloquially, someone who's exhausted might say, "I'm totally fried." Fried comes from the verb fry, which has the Latin root frigere, both "to fry" and "to roast."