Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses. It can lead to mild to severe illness and sometimes results in hospitalization or even death. Symptoms often include fever, cough, sore throat, body aches, and fatigue. The flu spreads easily, especially in crowded places, making it important to take precautions during flu season. Vaccination is one of the best ways to prevent the flu. The flu vaccine is updated each year to protect against the most common strains of the virus. Along with vaccination, practicing good hygiene, like washing hands frequently, can help reduce the spread of influenza.