ER is a critically acclaimed television series that aired from 1994 to 2009, focusing on the lives of emergency room staff at County General Hospital in Chicago. The show combines intense medical emergencies with the personal struggles of doctors and nurses, making it a compelling drama that captivated audiences for 15 seasons. The series is known for its realistic portrayal of medical procedures and the challenges faced by healthcare professionals. It introduced viewers to memorable characters like Dr. Doug Ross and Nurse Carol Hathaway, and it significantly influenced the medical drama genre, paving the way for future shows like Grey's Anatomy.