ATP is a

form of energy that can be used and stored
usable form of energy
form of energy that can be stored and released as heat.
storable form of energy

that can be used when needed.

A form of energy that can power many cellular processes and is essential for biological functioning.
ATP, or adenosine triphosphate, is often referred to as the "energy currency" of cells because it can be readily used and converted into a usable form of energy. It is involved in processes such as muscle contraction, active transport, and chemical reactions in cells. Additionally, ATP can be stored and released as heat when needed, making it a versatile and storable form of energy.