Eugenics is a movement aimed at improving the genetic composition of the human race, historically advocating selective breeding, while modern technologies allow for direct genetic alterations. The eugenics movement began in the late 19th century, marked by the establishment of the Eugenics Records Office, which associated undesirable traits with genetics rather than socioeconomic factors. Sterilization programs targeting deemed 'unfit' individuals affected around 65,000 Americans and raised ethical concerns about consent, contrasting with today's voluntary genetic testing practices.