Vaccines, often referred to as "shots," are medical preparations that help protect individuals from infectious diseases. They work by stimulating the body's immune system to recognize and fight specific pathogens, such as viruses or bacteria. Common vaccines include those for influenza, measles, and COVID-19. Receiving a vaccine typically involves an injection, which can be administered in a healthcare setting. Vaccines are crucial for public health, as they help prevent outbreaks and protect vulnerable populations. Immunization not only safeguards the individual but also contributes to community immunity, reducing the spread of diseases.