HIV prevention involves strategies to reduce the risk of acquiring the HIV virus, which can lead to AIDS. Key methods include using condoms during sexual activity, taking pre-exposure prophylaxis (PrEP) for those at high risk, and ensuring regular testing for sexually transmitted infections. Another important aspect of HIV prevention is the treatment of those already infected. When individuals with HIV take their medication consistently, they can achieve an undetectable viral load, meaning they cannot transmit the virus to others. This concept is often summarized as "U=U," or "Undetectable = Untransmittable."