Freeform optics is a rapidly growing field in optical design and engineering that focuses on the design and fabrication of optical components that do not have traditional symmetrical shapes, such as spheres, cylinders, or aspheres. These freeform optical surfaces are designed to significantly improve the performance of optical systems, such as reducing aberrations, improving imaging quality, and enabling compact and lightweight designs. Freeform optics offer greater flexibility in designing complex optical systems, allowing for improved performance and reduced size and weight. They are used in a wide range of applications, including advanced imaging systems, space telescopes, virtual and augmented reality devices, and laser systems. Research in freeform optics involves developing new design methods, fabrication techniques, and characterization tools to effectively design and manufacture these complex optical components. This field is constantly evolving and pushing the boundaries of what is possible in optical design and engineering.