Who discovered and developed radar?

Radar technology was developed in the early 20th century by multiple inventors and scientists, with significant contributions from figures such as Heinrich Hertz, who demonstrated the existence of electromagnetic waves, and Sir Robert Watson-Watt, who is often credited with creating the first practical radar system in the 1930s. In the United States, engineers like Edwin Armstrong and others also played vital roles in advancing radar technology during World War II. The collaborative efforts of these innovators led to the effective use of radar for military and civilian applications.