Hodgkin's Disease, also known as Hodgkin's Lymphoma, is a type of cancer that originates in the lymphatic system, which is part of the body's immune system. It is characterized by the presence of a specific type of abnormal cell called the Reed-Sternberg cell. This cancer can affect people at any age but is most commonly diagnosed in early adulthood (ages 20-30) and late adulthood (over 55 years).