No such word as INSULTION, but there is a word which is INSULTATION, meaning insult.
A batt is a form of insulation; instead of being a roll (as most insultion comes), a batt is usually a rectangular piece of insulation. A batt usually has a high R value and it is a lot thicker than most insulation so it is impractical to try to have it in rolls as they would be too large to handle easily.
Fat contains around 32 kj of energy per gram, thus it is the nutrient in which can provide the body with a sufficent amount of energy in order to carry out life functions, however since this seems like a more primary question I will refer to the basics of the use of fat- firstly the fat or lipids after being broken down by specific biological catalysts enzymes they are they absorbed into our body via the villi which is located on the walls of our small intestine (the ileum to be exact). However, unlike the other nutrients, fats DO NOT diffuse into our blood stream, instead it is asorbed into our by via the lacteal (found within the villi) therefore able for effecient transport around our body into the cells via the Lymphatic system ('Lymph system'). in short fat helps in the building of cells by providing their somewhat 'build' and also further aids in the bodies biological insultion. these are just the SIMPLE and basic functions of fat and is not to a standard in which you can benefit greatly from, but anyways, this should be suffice due to the standard of the question.