The device used to project images onto a screen is called a projector. Projectors are commonly used in educational settings, business presentations, and home theaters. They work by taking an image from a computer or other media source and enlarging it to display on a larger surface, such as a screen or wall. There are various types of projectors, including LCD, DLP, and LED projectors, each with distinct technologies and features. With advancements in technology, modern projectors can deliver high-resolution images and often come equipped with smart features for wireless connectivity, enhancing usability.