Preventable diseases are illnesses that can be avoided through specific actions, such as vaccinations, healthy lifestyle choices, and proper hygiene. Common examples include measles, diabetes, and heart disease. By taking preventive measures, individuals can significantly reduce their risk of developing these conditions. Vaccinations play a crucial role in preventing diseases like influenza and hepatitis. Additionally, maintaining a balanced diet, exercising regularly, and avoiding tobacco and excessive alcohol can help prevent many chronic diseases. Public health initiatives often focus on education and access to resources to help people make healthier choices and reduce the incidence of preventable diseases.