the monitoring of behavior and activities, often used for security or intelligence purposes.

a system that uses reflected radio waves to detect objects and determine their distance and speed.

रडार

English Usage: The radar detected an approaching aircraft long before it was visible.

Hindi Usage: रडार ने एक आसन्न विमान का पता उस से पहले ही लगा लिया था जब वह दृश्य में आया।