Lidar sensors are devices that use laser light to measure distances and create detailed maps of the environment. They emit rapid pulses of laser light and measure how long it takes for the light to bounce back after hitting an object. This information helps in determining the shape, size, and position of various surfaces. These sensors are commonly used in applications like autonomous vehicles, topographic mapping, and environmental monitoring. By providing precise 3D information, lidar technology enhances navigation systems and helps in analyzing landscapes, making it a valuable tool in various fields.