Genre: a paragraph about the benefits of an invention
A document camera can make classroom explanations easier to follow. First, it projects a real page or small object, so students can see a demonstration without crowding around one desk. Second, a teacher can show each stage of a worked example instead of only the final answer. Students can also compare two methods and discuss why they differ. The camera is useful for recording clear instructions that absent learners can review later. However, it should not display private marks or personal information. A simple privacy check is therefore part of using the invention responsibly. The device does not replace a good explanation; it helps more people see the evidence behind one.