The first universal system that allowed local networks to talk to each other was called TCP.

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TCP (Transmission Control Protocol) is a networking protocol that allows for data transmission between computers on the internet. It was created in the 1970s and is still widely used today. TCP allows for reliable communication between devices by dividing data into packets, reassembling them at the destination, and ensuring that packets are delivered in the correct order. It was one of the first protocols to enable communication between computers on different local networks, leading to the creation of the internet as we know it today.

The First Universal System That Allowed Local Networks to Talk