A document camera is an advanced classroom teaching aid tool that can project various documents, objects, or experimental operations in real time onto a large screen for the entire class to view. This type of device is typically equipped with a high-definition camera and an adjustable bracket, capable of capturing images of any material placed on the platform below it. In classroom teaching, document cameras can be used to display details of textbooks, handwritten notes, experimental steps, artworks, or other 3D objects. It enables teachers to explain complex concepts more intuitively, while encouraging students to participate in classroom interactions, becoming an important tool for enhancing visual assistance and improving learning experience in modern teaching.