Nitinol is a unique alloy made primarily of nickel and titanium. It is known for its remarkable ability to return to a predetermined shape when heated above a certain temperature. This property, called shape memory, allows Nitinol to be used in various applications, including medical devices, such as stents and guidewires, where flexibility and strength are essential. In addition to its shape memory, Nitinol also exhibits superelasticity, meaning it can undergo significant deformation without permanent change. This makes it ideal for use in products like eyeglass frames and orthodontic wires. Its combination of properties has made Nitinol a valuable material in fields like medicine and engineering.