Flexible electronics (also known as flex circuits) are electronic components and circuitry formed on a bendable and stretchable substrate. They are used as a substitute for traditional rigid printed circuit boards (PCBs) in applications where flexibility, low weight, and smaller size are desired. Flexible electronics can be used in a wide range of applications, such as consumer electronics, medical devices, automotive, military, and aerospace. Flexible electronic components are highly customizable, allowing engineers to design custom solutions for their specific application.