Light therapy, also known as phototherapy, is a form of treatment that involves exposure to specific wavelengths of light to improve a variety of health conditions. This type of therapy is commonly used to treat seasonal affective disorder (SAD), depression, sleep disorders, and skin conditions such as psoriasis. Light therapy works by simulating natural sunlight, which can help regulate the body's internal clock and improve mood and energy levels. Light therapy can be administered through specially designed light boxes, lamps, and wearable devices.