Fat and atp are different molecules tgat store energy compare the functions of these molecules in terms of energy storage

Fats and ATP are both energy molecules.

ATP is the source of energy which is directly used by each cell to carry out different functions. All cells use energy in the form of ATP. The mitochondria makes ATP by the process of cellular respiration whenever it is required by the body. ATP is not a stable molecule hence energy cannot be stored in this form.

Fats are long term energy storage molecules. Fats are stable molecules hence they can be used for long term energy storage.