Cholesteric liquid crystals (CLCs) are a unique class of liquid crystalline materials known for their helical structure and selective reflection of light, resulting in vibrant color interference patterns making them attractive candidates for a wide range of photonic applications. Designing, creating, and working with these optical microstructures in soft matter systems, such liquid crystals (LCs), would provide new avenues for both academic study and real-world applications. This book chapter explores the chemistry involved in creating CLCs, emphasising the molecular architecture, the function of chiral dopants, and the variables affecting the self-assembly of these crystals. The helical pitch and optical properties of CLCs can be accurately controlled through careful manipulation of chemical interactions, temperature, and concentration of chiral agents, enabling a wide range of applications, from display technologies to sensors. Selective light reflection and the capacity to generate structural colour are two of the distinctive optical characteristics of CLCs that result from their inherent ability to self-assemble into ordered, periodic structures. Additionally, we investigate the connection between the observed colour interferences and molecular structure, emphasising the recent progress in the design and functionalisation of CLC materials, which highlights the potential of CLCs to generate dynamic and responsive systems for the next generation of photonic and optoelectronic devices.