The common name of the disease caused by the varicella-zoster virus is chickenpox. It is a highly contagious viral infection characterized by an itchy, blister-like rash, fever, and fatigue. Chickenpox is most commonly contracted during childhood, but it can affect individuals of any age who have not been vaccinated or previously infected. While typically mild in children, chickenpox can lead to more severe complications in adults and those with weakened immune systems. Vaccination against varicella (the chickenpox vaccine) has significantly reduced the incidence of the disease, emphasizing the importance of preventive measures.