Nucleotides are the building blocks of DNA and RNA, which are essential molecules for life. Each nucleotide consists of three parts: a sugar molecule, a phosphate group, and a nitrogenous base. The sequence of these nucleotides encodes genetic information, determining everything from physical traits to biological functions. In addition to their role in genetics, nucleotides also play a part in cellular energy. For example, ATP (adenosine triphosphate) is a nucleotide that provides energy for many cellular processes. This makes nucleotides crucial not only for storing genetic information but also for powering the activities of living cells.