Define Classification of Fats and Fatty Acids?

You must be wondering in this unit on lipids why we are talking about fats and oils and not using the term lipids. Definitely when we talk about fats/oils, chemically we are referring to lipids. Lipids which are solid at room temperature are referred to as fats and those which are liquid are oils. Lipids are more apt when referred to all of them. However, in nutrition textbooks, fats and oils are referred in diets and lipids are referred in body fluids, like, serum lipid profile.