Cholesteric liquid crystals are a unique type of liquid crystal that exhibit a helical structure. This structure is formed by the arrangement of molecules that twist in a spiral pattern, which gives these materials their distinctive optical properties. They can reflect specific wavelengths of light, leading to vibrant colors that change with the angle of observation. These liquid crystals are commonly used in applications such as displays and sensors. Their ability to respond to temperature changes makes them useful in thermometers and other devices. Additionally, cholesteric liquid crystals are studied in the field of materials science for their potential in advanced technologies.