How the internet delivers a message, explained for a 10-year-old
There is no wire from you to your friend. Your message is cut into numbered packets that each find their own way and get put back together at the end.
The idea
When you send a message, your device chops it into small packets. Each one carries the destination address and its number in the sequence. Packets hop from router to router; a router doesn't know the whole route, it only picks the next hop. Different packets may take different roads and arrive out of order. The receiver puts them back in order by number and asks again for any that went missing.
Where kids get stuck
- Picturing one long wire between the two phones. There are many roads, and every message shares them with everyone else's.
- Thinking the message travels whole. It doesn't; that is exactly why a jammed road doesn't lose it.
- Thinking something in the middle "reads" the message to know where to send it. Only the address on the outside is read.
Try it at home
Write a short message on paper, cut it into strips, number them and add the recipient's name on each. Shuffle, and have the strips passed through different family members to the recipient, who sorts them and reads the message. Then "lose" one strip and let them work out what to ask for.