A lecture is basically an educational talk held for the students of schools and colleges. The lecture focuses on a particular topic, and the professor only talks about that topic. A lecture can go for an hour and has different sessions to complete the details of the given topic. There can be 100-200 students in a lecture depending upon the capacity of the lecture hall. The students need to be quiet during the lecture and not allowed to talk. They can only take notes and listen to the professor carefully.