You forget that IP is also a protocol not only addressing mechanism. There are IP packets that are sent from one machine to the other machine with different routes. But you can't guarantee that the order of packets will be preserved and that the packets will arrive at the destination. That's why there is TCP protocol that handle that. It guarantee that all packets will arrive and the protocol have mechanism to reassemble the packet at the other end. Without TCP/IP there would be no internet and the Web.
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You forget that IP is also a protocol not only addressing mechanism. There are IP packets that are sent from one machine to the other machine with different routes. But you can't guarantee that the order of packets will be preserved and that the packets will arrive at the destination. That's why there is TCP protocol that handle that. It guarantee that all packets will arrive and the protocol have mechanism to reassemble the packet at the other end. Without TCP/IP there would be no internet and the Web.