Displacement sensors are devices used to measure the distance between a sensor and an object. They can detect small movements or changes in position, making them essential in various applications, such as robotics, manufacturing, and automotive industries. Common types include linear variable differential transformers (LVDTs), capacitive sensors, and laser displacement sensors. These sensors work by converting physical displacement into an electrical signal, which can then be analyzed or recorded. They help ensure precision in processes like 3D printing and automated assembly, where accurate positioning is crucial for quality and efficiency.