COVID-19 tests are medical assessments used to determine if a person is infected with the SARS-CoV-2 virus, which causes the COVID-19 disease. There are two main types of tests: PCR tests, which detect the virus's genetic material, and antigen tests, which identify specific proteins from the virus. PCR tests are generally more accurate and are often used for diagnosing active infections. Testing is crucial for controlling the spread of COVID-19, as it helps identify infected individuals, even if they do not show symptoms. Regular testing can also assist in monitoring outbreaks and ensuring public safety, especially in high-risk settings like schools and hospitals.