Cooking food on high heat with lots of cooking fat so the food floats on top while cooking is deep-frying.  A deep fat fryer can make the process easy and less greasy than on-stove cooking.  This is because less fat is required, a basket is provided for easy food removal and no guesswork is needed for maintaining the proper temperature of the oil. And best of all, most have systems to filter and drain the used oil, making clean up much easier.