Gene variants refer to changes or differences in a gene's DNA sequence. These variations can occur naturally and may be inherited from our parents, acquired through mutations during our lifetime, or introduced by exposure to environmental factors such as radiation, chemicals, or viruses. Gene variants play an important role in the development of genetic disorders, susceptibility to diseases, and individual differences in traits like appearance, behavior, and response to medication. Understanding gene variants can help researchers identify potential disease-causing mutations, develop personalized medicine approaches, and better understand human evolution and adaptation.