A Control Area Network (CAN) bus is a serial communication protocol that allows devices to exchange data in a reliable and efficient way. It is widely used in vehicles, working like a nervous system to connect ECUs in the vehicle.

CAN bus was originally designed for automotive applications by Bosch in the 1980s. It is a multi-master, multi-slave, half-duplex, and fault-tolerant protocol that fits well with the requirements of automotive applications. It is simple, low-cost, and reliable and can be used in harsh environments. The CAN bus provides one point of entry for all the ECUs in the vehicle, which makes it easy to connect and diagnose.

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