A document camera, also known as an visualizer or an overhead projector, is a device used to capture and display live images of physical objects, such as books, documents, or three-dimensional objects, to a computer screen or a projector. Document cameras typically have a camera mounted on a flexible arm, allowing for easy manipulation and positioning. They are commonly used in classrooms, offices, and other educational settings for presentations and demonstrations. Some document cameras also have features such as image capture, annotation, and recording capabilities. Document cameras are an efficient and effective way to show live images in a digital format, enhancing the visual aspect of presentations and lessons.