**Upper Limb Rehabilitation for Parkinson's Study** This study looks at using a special robot to help improve the movement of arms in people with Parkinson's disease (PD). Parkinson's is a disease that affects how you move, often causing shaking, stiffness, and slow movements. The study will compare two groups: one using a **robotic device** to exercise the shoulder, elbow, and wrist, and the other receiving **conventional therapy**, which is like regular exercises and care. **Key Points:** - **Length and Visits**: Participants will be involved in the study for a specific period, needing to attend multiple sessions. - **Eligibility**: You must be 30-80 years old, diagnosed with mild to moderate Parkinson's, and able to follow study instructions. - **Compensation**: Check with the study team for details about any potential compensation or support. This study aims to see if the robotic device can make arm movements better than standard exercises can. Participants will be evaluated on coordination and function improvements through tests like the ARAT (Action Research Arm Test) and UPDRS (Unified Parkinson's Disease Rating Scale).