Final answer:
Chickenpox is also known as varicella and is caused by the varicella-zoster virus, a member of the herpesvirus family. It can be more severe in adults and may lead to complications such as pneumonia.
Step-by-step explanation:
Chickenpox, also known as varicella, is another name for chickenpox. It is caused by the varicella-zoster virus, which is a member of the herpesvirus family. The disease is mild and self-limiting in children, but can be more severe in adults and can lead to complications such as pneumonia.