The document discusses chicken pox, a highly contagious viral infection caused by the varicella zoster virus. It is characterized by an itchy rash of small blisters appearing in crops all over the skin. The virus is spread through direct contact with the fluid from skin eruptions or through the air from an infected person's nose or throat. While chicken pox is usually mild and self-limiting in children, it can be more serious in adults and those with weakened immune systems. Treatment focuses on reducing symptoms, and a vaccine is available to prevent infection.