What is the difference you may ask? A frittata is the simplest of all the egg dishes to make. It's merely an unfolded Italian omelet with all the filling ingredients cooked on top. You can make it on top of the stove until almost set and then finish it in a number of ways: under the broiler, in the oven, turned over in the pan, or simply covered and allowed to stand off the heat until the top is completely cooked.
A strata involves layers of milk, egg, cheese and bread baked into a puffy casserole. The strata is not only a good way to make dry bread and cheese tasty, it's also an economical way to put to good use the dribs and drabs of other foods in your fridge. Stratas are a great versatile dish for families and cooks on the run -- you can even prepare it the day before and bake it the next day.