What is the purpose of ATP molecules in plant and animal cells?

ATP stands for Adenosine Triophosphate.

Energy is stored in the form of ATP molecules in plants and animal cells. Thus, the purpose of ATP is to store energy in plants and animals.

ATP is an abbreviation form of Adensine Triphosphate. The major function of ATP in the cell is to store and transport energy within the cells. It is the only form of energy source that is usable by the cell. ATP is made up of five elements, which are nitrogen, hydrogen, carbon, oxygen and phosphorus. ATP molecules possess unstable high energy bonds, thus it is easy for it to become hydrolyzed in biochemical reactions to release large amount of energy.

Apart from production of energy, ATP also act as co enzymes in some biochemical reactions.