These fries, or chips, as they are called in the United Kingdom and Australia, are deep-fried.
Frying is cooking food in hot butter or vegetable oil or other fat. We can fry food in a small amount of fat in a pan or in a lot of oil in a pot. Some restaurants use deep frying to fry a large amount of food in a lot of oil, especially when cooking fast food like french fries, doughnuts, and chicken nuggets. Fried food is often considered unhealthy because vitamins like vitamin A and vitamin C are lost during cooking, and diets consisting of mainly fried food are linked to high risks of strokes, heart attacks, and obesity.