While AI unicorns chase $300B valuations on vaporware, TCP's 3-way handshake has been quietly ensuring your cat videos don't vanish since '74

The Transmission Control Protocol (TCP) plays a crucial role in ensuring reliable communication over the internet. When data is transferred, it is broken into small packets, and TCP guarantees that all packets are delivered correctly, without corruption, and in the right order. The TCP 3-way handshake initiates a connection, where a computer sends a synchronize message with a starting sequence number, such as 100. If a packet is lost, TCP waits and resends it, while sequence numbers organize out-of-order packets and checksums detect corrupted data. This process enables successful downloads. To close a connection, a computer sends a finish message, and the connection is terminated with a 4-way handshake. TCP's importance lies in its ability to provide reliable data transfer, tracking packets with sequence numbers, and automatically resending lost or corrupted data. This ensures that data arrives intact, making TCP a fundamental component of online communication, facilitating secure and efficient data exchange over the internet.