The COVID-19 vaccine is a medical preparation designed to provide immunity against the SARS-CoV-2 virus, which causes the COVID-19 disease. Vaccines work by stimulating the body's immune system to recognize and fight the virus if exposed in the future. Several types of vaccines have been developed, including mRNA vaccines like Pfizer-BioNTech and Moderna, as well as viral vector vaccines like Johnson & Johnson. Vaccination is a key strategy in controlling the spread of COVID-19 and reducing severe illness and hospitalization. Health authorities recommend vaccination for eligible individuals to help protect not only themselves but also the wider community. Vaccines have undergone rigorous testing to ensure their safety and effectiveness before being authorized for public use.