Computing · Stage 5

Packets: How Data Travels

Programs & Judgement · networks — a big message is split into small packets that each find their own path, then get put back in order

✦ Computing📘 Stage 5 · S5⏱ ~12 min🧒 Ages 9–10★ Free to start

I can explain how data travels in packets.

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Kavi Sends a Big Photo

Kavi wanted to send a huge photo of the whole forest to a friend far away. "It's too big to send in one go," Kavi hooted. So the computer did something clever: it cut the photo into lots of tiny pieces. On each piece it wrote the address of where it was going and a number — piece 1, piece 2, piece 3… — like pages torn from a book. These little labelled pieces are called packets. The packets zoomed off across the internet, and some even took different roads to get there! They arrived all jumbled up, but the friend's computer just read the numbers and put them back in order. "So a big thing travels as many small packets," said Kavi, "and the numbers tell us how to rebuild it. Clever!"

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What your child will learn

1What one packet carriesA packet is a small, labelled piece of a bigger message. It is more than just the data — it also carries labels so the network can deliver it and the receiver can rebuild the message. Tap each part to learn its job.

2How a big message travelsSending data is a little program — steps in order. A big message is cut into packets, the packets travel the network, and they are rebuilt at the other end. Press ▶ Run and watch the whole journey.

3Putting jumbled packets back togetherBecause packets can take different paths, they often arrive in the wrong order — packet 5 might beat packet 3. That is fine: the numbers make it easy to rebuild. Tap each step.

4One big lump, or many small packets?Why bother cutting a message into packets instead of sending it all at once? Compare the two ways and you will see why the whole internet uses packets. Tap each card.

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A peek inside

Kavi wants to send a huge video to a friend. Instead of sending it as one giant piece, the computer cuts it into many small pieces first. What do we call those small pieces, and why is splitting a good idea?

a big message is broken into small labelled pieces so they can share the network

Try this at home: A big message is broken into small pieces called ____.

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Start the free interactive lesson, or print the handout for screen-free play.

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Part of Computing · Stage 5 · S5 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.