An overhead projector is a device used to display images or text on a screen or wall. It works by shining a bright light through a transparent sheet, called a transparency, which contains the information to be projected. This allows teachers, presenters, and speakers to share visual content with an audience in a clear and engaging way. Overhead projectors are commonly used in classrooms, meetings, and conferences. They are simple to operate and can display various materials, such as diagrams, charts, and written notes. Although digital projectors have become more popular, overhead projectors are still valued for their ease of use and reliability.