Multifunction devices (MFDs) are machines that combine several functions into one unit, typically including printing, scanning, copying, and faxing. These devices are commonly used in offices and homes to streamline tasks and save space, as they eliminate the need for multiple separate machines. MFDs can connect to computers and networks, allowing users to manage documents more efficiently. They often come with features like wireless connectivity, touchscreens, and advanced security options. Popular brands of MFDs include HP, Canon, and Brother, which offer various models to suit different needs and budgets.