A projector is an output device that projects an image onto a large surface, such as a white screen or wall. It may be used an alternative to a monitor or television when showing video or images to a large group of people.
Projectors come in many shapes and sizes though they are commonly about a foot long and wide and a few inches tall. They can be mounted on ceilings or may be freestanding and portable. Ceiling-mounted projectors are typically larger, especially ones that project a long distance (such as 30 feet or more). These projectors are commonly found in classrooms, conference rooms, auditoriums, and places of worship.
Portable projectors can used wherever there is a bright surface (such as a white or light colored wall). Most projectors have multiple input sources, such as HDMI ports for newer equipment and VGA ports for older devices. Some projectors support Wi-Fi and Bluetooth as well.