What characteristics make an overhead projector a popular instructional tool?

An overhead projector is widely regarded as a popular instructional tool primarily because it is common, flexible, and economical. Its prevalence in educational settings makes it easily accessible for both instructors and students. The flexibility of the overhead projector allows instructors to project a variety of materials, such as transparency sheets, images, and written content, facilitating different instructional strategies and enhancing engagement. Additionally, it represents a cost-effective option compared to more technologically advanced equipment, making it a practical choice for a wide range of teaching environments. These characteristics contribute significantly to its sustained use and effectiveness in delivering educational content.