How messages travel across a network — Computing, 7–10 years
When devices communicate, a message can be divided into small packets and sent through connected equipment. This explains why a message can reach another device even when the path is not a single straight line.
A network passes small packets
A network is a group of connected devices that can exchange information. Instead of sending a long message as one solid block, a device can split it into packets, each carrying part of the message and directions for its journey. The receiving device puts the packets back together in the right order.
Why split a message?
A shared network may be carrying many messages at once, and one connection may become busy or stop working. Small packets can take turns, use different available routes and be sent again if one goes missing. This solves the problem of sharing a complicated network without reserving one whole path for one message.
Sending a photo
Suppose a photo is divided into four packets: A, B, C and D. A router sends A and B along one available route, while C and D take another; D arrives first, then B, A and C. The receiving device reads each packet’s label, waits for all four, and rebuilds the photo in the order A, B, C, D.
The internet is not one cable
It is reasonable to picture a message travelling along one direct line, like a letter on one road. In reality, networks contain many connected devices and routes, and packets may take different paths. Also, the internet is the network of networks; the web is one service that uses it, not the whole thing.
Messages, games and video calls
When you send a message, join an online game or make a video call, information travels between devices across networks. Packets may carry words, game actions, voices or pictures, depending on the service. If the network is crowded, packets can wait or arrive late, which is why a call may freeze or a game may lag.
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