A Course Plugin is an extension component developed for content management systems (such as WordPress) to quickly build and manage online course systems within a website. It typically provides core features like course publishing, chapter management, video/document hosting, student management, progress tracking, quizzes/exams, and paywalls. This enables non-technical users to easily set up fully functional online education platforms, making it a key technical tool for scenarios such as knowledge monetization, corporate training, and skill-based education.