Hepatitis B is a viral infection that affects the liver, causing inflammation and potentially leading to serious health issues. It is caused by the hepatitis B virus (HBV) and can be transmitted through contact with infected bodily fluids, such as blood or sexual fluids. Many people may not show symptoms, but the virus can still harm the liver over time. Vaccination is an effective way to prevent hepatitis B. The hepatitis B vaccine is safe and recommended for infants, children, and adults at risk. Early detection and treatment can help manage the infection and reduce the risk of severe liver damage or complications like cirrhosis and liver cancer.