Dna methylation is an epigenetic modification involving the addition of a methyl group to a DNA molecule, predominantly at cytosine residues within CpG dinucleotides. This key regulatory mechanism is extensively investigated in molecular biology and genetics for its critical role in controlling gene expression, cellular differentiation, development, and maintaining genome stability. Its characteristic patterns are dynamic and heritable (though reversible), profoundly influencing chromatin structure and transcriptional activity, and its aberrant states are central to understanding various biological processes and disease pathologies.