A projector or image projector is an optical device that projects an image onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.
A multimedia projector is a compact, high resolution, full-color projector capable of projecting text, images, video and audio content. Typically, the projector will feature inputs for a computer, DVD player, VCR, CD player and storage device.
A Pico projector is a small hardware device designed to project content from a smart phone, camera, tablet, notebook or memory device onto a wall or other flat surface. Pico projectors are also known as pocket, handhold or mobile projectors and they take a number of formats that work in various ways.