Kaposi's Sarcoma is a type of cancer that forms in the lining of blood vessels and lymphatic vessels. It often appears as purple, red, or brown spots on the skin or mucous membranes. This condition is most commonly associated with HIV/AIDS and can occur in people with weakened immune systems. There are different forms of Kaposi's Sarcoma, including classic, endemic, and epidemic types. Treatment options may include radiation therapy, chemotherapy, or antiretroviral therapy for those with HIV. Early diagnosis and treatment are important for managing the disease effectively.