What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Shortening, Spread, Butter and Margarine

The human beings need energy to survive and to perform regular activities of daily life. They get energy in form of calories which is obtained from different types of food and eatables. These materials are necessary for not only providing energy but they also make the human fit and healthy and makes him able to cop up with the difficulties of life.