Video narration
How can one message cross the internet so quickly, when it travels through many networks? Think of sending a long message as mailing labeled envelopes. Your data is the shipment, and each envelope carries one piece. Here's the turn: the message does not travel as one solid block. It is divided into packets-small pieces that move independently. Each packet carries the destination and its place in the message. At each stop, a router reads that information and forwards the packet onward. Unlike one postal truck on one fixed route, packets use available paths. They may share routes or take different ones, and arrive out of order. At the destination, the packets are put back in sequence to reassemble the original message. So how does it arrive so fast? It travels as labeled packets, takes a network journey, and becomes whole again.