Epigenetic regulation refers to the processes that control gene expression without altering the underlying DNA sequence. This regulation involves chemical modifications to the DNA or associated proteins that can turn genes on or off. Epigenetic changes can be influenced by environmental factors, such as diet, stress, and exposure to toxins, and are reversible, meaning they can be modified throughout an individual's lifetime. Research in this area explores how epigenetic mechanisms impact various biological processes, including development, disease, and behavior, providing insights into the complex relationship between genetics and the environment.