Electronic Health Records (EHRs): These digital versions of patients' paper charts contain comprehensive medical histories, including diagnoses, treatments, and outcomes. Insurance Claims: Billing and reimbursement records offer data on treatments provided and their associated costs. Patient Registries: Organized systems for collecting uniform data on patient populations, often focused on specific diseases like cancer. Wearable Devices: Fitness trackers and other wearable technology can capture data on physical activity, sleep patterns, and other health metrics. Social Media: Patient-reported outcomes and experiences shared on platforms like Twitter and Facebook.