Epigenetics is the process by which the DNA methyltransferase (MTase) family of enzymes catalyze the transfer of a methyl group to DNA.
When the methyl groups are added to the DNA molecule, it can change the activity of a DNA segment (like a mutation) without changing the sequence inherited from parents.
Although your DNA does not change, MTase disrupts the activity of a DNA segment so it behaves in a different way, either amplifying positive change or mitigating negative potential.