Human genetics is the study of how genes, the basic units of heredity, influence physical traits and health in humans. Each person inherits a unique combination of genes from their parents, which determine characteristics such as eye color, height, and susceptibility to certain diseases. Genes are made up of DNA, which carries the instructions for building and maintaining the body. Understanding human genetics helps researchers identify genetic disorders and develop treatments. Advances in this field, such as the mapping of the human genome, have opened new avenues for personalized medicine and improved healthcare outcomes.