This document discusses different types and structures of lectures used for teaching at the university level. It identifies several roles of university teachers, including planner, manager, academic guide, advisor, researcher, and consultant. The document also categorizes lectures based on levels of student interaction, such as formal, Socratic, and interactive lectures. Additionally, it categorizes lectures based on content, such as expository, storytelling, and problem-solving lectures. Finally, the document outlines advantages and disadvantages of lectures and provides tips for structuring effective lectures.