Nucleotide diversity refers to the variation in DNA nucleotides present within a population or species. Some synonyms for nucleotide diversity may include genetic diversity, molecular diversity, or DNA polymorphism. Other similar terms may include allelic diversity or allelic heterozygosity, which describe the variation in different versions (alleles) of a gene within a population. Additionally, nucleotide diversity may also be related to terms like genomic diversity or sequence variation, which refer to the differences in DNA sequence between individuals or populations. Regardless of the particular term used, studying nucleotide diversity is important for understanding the evolutionary history and genetic health of a population or species.