This Computing scheme of work video supports pupils in understanding how files are sent through a network. This video highlights invisible processes behind everyday actions like sharing images, videos and documents.

In this lesson, pupils learn that when we send a file—like a photo, piece of writing, or song—we’re actually triggering a complex journey across a network. They’ll explore how different types of files (like JPEGs for pictures or MP3s for sound) travel between devices. Through an unplugged, role-play activity, pupils will act out this journey themselves to deepen their understanding.

The video walks through the stages of sending a file: the device makes a request via a wireless access point, which sends it on to the wired network. From there, a switch directs it to the school server, which acts like the hub of the network. The server then checks with the recipient’s device that it’s ready before allowing the file to travel back along the same route to complete its journey.

By the end of the video, pupils will understand that although file transfers feel instant, there’s a carefully coordinated process taking place in the background—thanks to networking hardware like routers, switches and servers. The video is part of the Year 3 Computing systems and networks 1: Networks unit.

See more of our Year 3 Computing scheme of work.

Computing, Year 3, Computing systems and networks 1: Networks, Lesson 2: A file’s journey.