Sonar Full Form:
Sonar stands for Sound Navigation and Ranging.

Explanation:
Sonar is a technology that uses sound waves to detect and locate objects underwater. It works on the principle of sending out sound waves and listening for their echoes as they bounce off objects in the water. By analyzing the time it takes for the sound waves to return and the direction from which they come, sonar systems can create detailed images of underwater environments.

Key Points:
- Sonar is widely used in various applications such as navigation, fishing, marine research, and military operations.
- There are two main types of sonar: active sonar, which emits sound waves, and passive sonar, which listens for sounds already present in the environment.
- Sonar technology has advanced significantly over the years, leading to the development of sophisticated systems that can provide high-resolution images of underwater objects and structures.
- One of the most well-known uses of sonar is in naval operations for detecting submarines and underwater mines.
- Sonar has also been used in marine biology to study marine animals and their habitats, as well as in underwater archaeology to explore and map underwater archaeological sites.

In conclusion, sonar plays a crucial role in underwater exploration and research, providing valuable information about the underwater world that would otherwise be inaccessible.