ATP (adenosine triphosphate) belongs to the category of nucleotides.

Here's why:

* Nucleotides are the building blocks of nucleic acids (DNA and RNA). They consist of three parts:

* A nitrogenous base: In ATP, this is adenine.

* A five-carbon sugar: In ATP, this is ribose.

* One or more phosphate groups: ATP has three phosphate groups.

While ATP is often associated with energy, its classification as a nucleotide is based on its chemical structure.