A flexible circuit is a type of electrical circuit that can bend and twist without breaking. Unlike traditional rigid circuits, flexible circuits are made from materials like polyimide or polyester, allowing them to conform to various shapes and sizes. This flexibility makes them ideal for use in compact electronic devices, such as smartphones and wearable technology. These circuits can integrate multiple components, such as resistors and capacitors, onto a single flexible substrate. This design not only saves space but also reduces weight, making them essential in modern electronics. Applications of flexible circuits include medical devices, automotive systems, and consumer electronics.