What is the role of ATP in a cell?

Adenosine triphosphate (ATP) is a small molecule that acts as a coenzyme within a cell.
The main role of ATP is to provide energy. Below are the ways it provides energy which can described in an exam.
1) A source of energy.
2) An ATP molecule releases approximately 30kJ (mol^-1) of energy
3) Energy from an ATP molecule is released in small quantitites to prevent damage to the cell
4) Energy released is used for metabolism in the cell. Other reactions that require energy from ATP include; active transport/ muscle contraction/ glycolysis.