Professors' talks, also known as lectures, are a common form of teaching in universities and colleges. Lectures are typically given by professors to a large group of students, and involve the professor presenting information on a particular topic. Lectures can be used to introduce new topics, review material, or provide an overview of a subject. They are often accompanied by visual aids such as slides, videos, or diagrams. Lectures are an important part of the learning process, as they provide students with the opportunity to gain knowledge from an expert in the field.