What does RADAR stand for?

RADAR stands for "Radio Detection And Ranging." This acronym accurately reflects the technology's function: it uses radio waves to detect the presence, distance, speed, and other characteristics of objects, such as aircraft or ships. The term "detection" highlights the system's ability to identify objects, while "ranging" refers to determining their distance from the source of the radio waves.

The other options do not accurately represent the established terminology associated with RADAR. They either misplace or alter the key components of the acronym, leading to definitions that do not align with the technology's actual capabilities or common usage in the field. Understanding this original meaning is crucial for grasping the principles of how RADAR operates in various applications, from aviation to meteorology.