A data acquisition system is a system that consists of a computer, measurement devices, and sensors. Processing acquired data requires a data acquisition system, which gathers the information needed to comprehend electrical and physical processes.

In HIL testing, a device and the environment are used to make the electronic control unit (ECU) feel like it is responding to real-world conditions. All the required electronic parts are present on the HIL test bench. In order to determine whether the system under test responds correctly to the inputs, a simulator exposes inputs to real systems, which then send signals to them.