Pre-exposure prophylaxis (PrEP) is a preventive measure for human immunodeficiency virus (HIV) infection. It involves taking a daily dose of antiretroviral medications before potential exposure to the virus. PrEP has been shown to be highly effective in preventing the transmission of HIV when taken consistently and as prescribed. PrEP works by blocking the virus from establishing an infection in the body. If a person who is taking PrEP is exposed to HIV, the antiretroviral medications present in their body can prevent the virus from taking hold and replicating. As a result, PrEP can significantly reduce the risk of HIV transmission. PrEP is recommended for people who are at high risk of HIV transmission, including men who have sex with men, people who have unprotected sex with multiple partners, people who inject drugs, and people who have a sexual partner who is living with HIV. PrEP is a personal choice, and the decision to use PrEP should be made in consultation with a healthcare provider who can assess the individual's risk of HIV transmission and determine if PrEP is a good option for them. It's important to note that PrEP is not a substitute for other preventive measures such as using condoms, practicing safe sex, and getting tested for HIV regularly. PrEP should be taken in conjunction with these other preventive measures to reduce the risk of HIV transmission as much as possible.