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Automotive radar has become a key technology in modern vehicles, driving advancements in Advanced Driver Assistance Systems(ADAS).This chapter takes a comprehensive look at how the radar systems work, starting from the fundamentals and moving through the full signal chain—from antennas to real-world applications. The discussion begins with the basics of radar technology and the different types of automotive radars in use today. It then dives into the critical components including RF and the signal processing chain, explaining how raw IQ data is converted into meaningful range, velocity, and angle measurements using simple examples. The concept of the radar cube is introduced, showing how it organizes radar data and why angle resolution is crucial, especially in MIMO radar systems. Beyond the technical details, the chapter also covers radar calibration, communication protocols, and the global regulatory standards shaping the deployment of automotive radars.