Adult non-tech: Network is the way that allow devices to communicate and share data with each other. All devices have to be conected to the same router, so they can send and receive data from each other. As an example, if we need to print a paper, the computer and the printer must be connected to the same router. 

4th grade student: Network means if two or more devices connected to the same wifi, they can share videos, games and files. as an example connecting the tablet with the tv to see videos, they have to be connected to the same wifi