Electronic Health Records (EHRs) are the backbone of modern healthcare informatics, transforming how patient information is recorded, stored, and shared. Unlike paper charts of the past, EHRs allow clinicians to access comprehensive patient histories in real time, support clinical decision-making, and facilitate data-driven research. They integrate diverse types of data, including lab results, imaging, medications, and patient-reported outcomes, creating a holistic view of each patient. In this post, I will explore the evolution of EHR systems, the key technologies that power them, and how they enable better patient care and research opportunities. As I continue my learning journey, I will also reflect on practical insights from working with these systems and understanding their role in the broader healthcare ecosystem.