"Multi-functional" refers to an object or system designed to perform multiple tasks or functions. For example, a multi-functional printer can print, scan, copy, and sometimes even fax documents, making it a versatile tool for both home and office use. This design helps save space and reduces the need for multiple devices. In various fields, such as technology and furniture design, multi-functional items are increasingly popular. A sofa bed serves as both a seating area and a sleeping space, catering to different needs in limited living areas. This adaptability enhances efficiency and convenience in everyday life.