The Td vaccine is a combination vaccine that protects against two diseases: tetanus and diphtheria. Tetanus is a serious bacterial infection that affects the nervous system, while diphtheria is a respiratory illness caused by bacteria that can lead to severe complications. The Td vaccine is typically given to adolescents and adults as a booster shot every ten years to maintain immunity. Receiving the Td vaccine is important for public health, as it helps prevent outbreaks of these diseases. It is especially recommended for individuals who may be at higher risk, such as those with wounds or injuries. The vaccine is safe and effective, contributing to the overall reduction of tetanus and diphtheria cases.