A receptor, or sensor, is a specialized structure that detects changes in the environment and converts these changes into signals that can be understood by the body. Receptors can be found in various forms, such as neurons that respond to light, sound, or chemical signals. They play a crucial role in how organisms perceive their surroundings and react accordingly. Receptors are essential for many biological processes, including sensation, homeostasis, and communication within the body. For example, taste receptors on the tongue help identify different flavors, while thermoreceptors in the skin detect temperature changes. This information is vital for survival, allowing organisms to adapt to their environment.