A shape-memory alloy is a material that exhibits the property of returning to its original shape when heated above a certain temperature. Also known as smart alloys, they are used in a variety of fields, including medical devices, aerospace, and consumer electronics. Some common synonyms for shape-memory alloys include memory metals, memory alloys, and pseudoelastic alloys. These materials are typically made from titanium, nickel, or copper and often contain small amounts of other elements like iron or manganese. They are known for their unique properties, which allow them to change shape in response to temperature and stress, making them valuable for a wide range of applications.