Which device is primarily used to send output from a computer to print a document?

The printer is specifically designed to receive digital information from a computer and produce a physical copy, such as a printed document. It translates the digital data into a format that can be imprinted on paper, allowing users to generate hard copies of documents, images, and other content created on a computer. This is the primary function of a printer, distinguishing it from other devices.

A scanner, for instance, is used to convert physical documents into digital formats but does not output printed material. A monitor displays information visually but does not produce any physical copies. A router facilitates network communication and internet connectivity but has no role in producing printed outputs. Therefore, the printer is the essential component for turning digital files into tangible printed documents.