This study investigates Parkinson's disease and aims to understand who gets it and why. The study collects health and demographic information from participants with and without Parkinson's disease. Participants will be involved in the study for several years, answering questions about their health online every 90 days. This study is conducted remotely and includes participants from various countries, including the United States, Canada, and several European nations.

Participants will answer questions about their health and may be invited for additional testing based on their responses. The study requires participants to have internet access to complete the surveys. Depending on the data provided, participants might also be asked to join further studies. The study is designed to securely capture data over time, helping researchers understand Parkinson's disease better.

• Who can participate: Adults 18 years or older in the United States, Canada, or select European countries can participate. Eligibility includes having a family member with Parkinson's, acting out dreams, loss of smell, or being a man over 60.
• Study details: Participants will answer online surveys about their health every 90 days. They may be invited to provide more information or join further studies.