Routing
An address does you no good if you have no way of getting there. You need wheels (and likely gas money).
The “wheels” of the Internet is the Transport Control Protocol/Internet Protocol, or as it is more commonly known, TCP/IP.
TCP/IP sees everything in terms of packets. Instead of moving data in a long stream like unraveling a roll of movie film, the protocol breaks it into pieces. Having a bunch of short chunks automatically ensures that there will be breaks in the flow of data during which other computers can negotiate for time to send their own packets. At the distant end of the connection, the packets get reassembled to put the data back into its original form.
Each has a predefined structure, with a header that contains address, ...
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