An overhead projector is a device that projects images or text onto a screen or wall using a bright light source. It works by shining light through transparent sheets, called transparencies, which contain the information to be displayed. This allows teachers and presenters to share visual content with an audience in a clear and engaging way. Overhead projectors are commonly used in classrooms, meetings, and presentations. They are simple to operate and can display a variety of materials, including diagrams, charts, and written notes. Although digital projectors have become more popular, overhead projectors are still valued for their ease of use and reliability.