This document discusses learning management systems (LMS), virtual learning environments (VLE), and managed learning environments (MLE). It describes LMS/VLE as integrated online platforms that provide tools for content delivery, interaction, and administration. Common functions include posting course materials, online discussions, assignments, exams. LMS/VLE can be proprietary, open-source, or custom-built. While proprietary systems provide support, open-source offers flexibility but requires internal support. MLEs take a broader view, incorporating multiple LMS/VLEs plus library and other campus systems. Overall, LMS/VLEs aim to provide a unified e-learning space, meeting most teaching and learning needs.