Identification of Physiological Data by a Wearable Monitor in Subjects Suffering From Major Depression Disorders

This study is testing whether a wearable monitor (like a smartwatch or biosensor) can detect and track physical signals (such as heart rate, sleep, or movement patterns) that reflect how someone with major depression is feeling. The goal is to improve monitoring of depression between doctor visits. **You may be eligible if...** - You have been diagnosed with a major depressive episode (under DSM-5 criteria) - Your depression score on a standard scale (MADRS) is 20 or higher, indicating moderate-to-severe symptoms - You are willing and able to wear the device for 6 months - You can understand and follow the study procedures **You may NOT be eligible if...** - You have treatment-resistant or chronic depression - You have depression with psychotic features, schizophrenia, or bipolar disorder - You have a substance use disorder in the last 6 months - You have a severe physical condition that would affect wearing the device - You are pregnant Talk to your doctor to see if this trial is right for you.