Question

what is an overhead projector
GPT 3.5
An overhead projector is a device that projects images or documents onto a flat surface, such as a wall or a screen. It consists of a light source, an image transparency, and a lens system to project the transparency onto the surface. It was commonly used in education and business settings before the advent of digital projectors and PowerPoint presentations. The transparency can be a printed document, a photograph or any image placed on a transparent sheet, allowing the presenter to display the information to a large group.