Varicella is a medical term used to describe the viral disease commonly known as chickenpox. In medical literature, varicella is often referred to using a range of synonyms including varicella-zoster virus, VZV, human herpesvirus-3, and HHV-3. These synonyms are used interchangeably to describe the same disease caused by a highly contagious virus that can spread through contact with infected individuals. The symptoms of varicella include blister-like rashes, fever, headache, and fatigue. A vaccine is available to prevent varicella, and it is highly recommended that individuals receive it to prevent the spread of this disease.