Course Management Systems are a subset of Content Management Systems. Course Management Systems (also called "Learning Management Systems" or "Virtual Learning Environments") are software packages designed for teachers and students to easily share information relevant to their course. Most are web-based. Virtual Classrooms are different than Course Management Systems but are sometimes incorporated within them. A Virtual Classroom is usually a synchronous online meeting-space that includes text chat, shared whiteboard, and might include shared audio, video, polling, etc.