|Similar to how letters form words, bases form the genetic code that creates genes.|
International DNA Day April 25.
Today, in 1952, James Watson, Francis Crick, Rosalind Franklin, Maurice Wilkins, et al published papers in Nature (the journal) on the structure of DNA.
It is also the day (in 2003) that the Human Genome Project was declared nearly complete and "the remaining tiny gaps [were] considered too costly to fill."
DNA stands for deoxyribonucleic acid.
The bases can be thought of like letters in an alphabet; as letters can be combined to create many words, the sequences of bases create the language of the genes.