Successful e-learning courses possess several key characteristics, including engaging content, interactivity, and clear learning objectives. They should cater to diverse learning styles with multimedia resources like videos, quizzes, and interactive simulations. Effective course design also includes regular assessments to track progress and provide feedback. Additionally, fostering a sense of community through discussion forums or group activities can enhance learner engagement. Ultimately, well-structured e-learning courses lead to improved knowledge retention and satisfaction among participants, driving better educational outcomes.