Shortening and butter are two types of fat, both are similar because they contain fat and they are also used for baking processes. However, there are some differences between them. Shortening is a substance with 100 percent solid fat content. Butter, on the other hand, has a higher percentage of fat in its content but it is made together with dairy products like milk, and a percentage of water.
Another noticeable difference is how they react with heat during baking process. Shortening does not melt totally when heat is applied on it due to the 100 percent fat content it has, while butter melt at a very faster rate than shortening because of the dairy product(milk) that it contains, and becomes thinner when melted. Another difference is that, products made with shortening are more softer than products with butter. Finally, while butter can generally be used as flavoring, shortening does not add flavor