A digital projector projects digital images from devices like cameras, video cameras, or smart boards onto a large screen or whiteboard so that groups can see. Digital projectors allow teachers to incorporate more hands-on technology into lessons to engage students in new ways. There are different types of projectors including overhead, document cameras, and digital projectors, with digital projectors connecting to computers to display content for large groups. The document discusses using digital projectors in classrooms to support various learning styles through visual, tactile, and kinesthetic activities like videos and interactive assignments displayed on the screen.