Shape memory alloys are a group of alloys with distinctive and superior properties compared to other alloys. These materials strongly respond to certain thermodynamic and mechanical parameters. They can return to their original shape upon application of the parameters mentioned in a way that evokes the behavior of living organisms. When a conventional alloy is subjected to an external load more than yield strength, it deforms permanently, but this deformation remains after the load is removed. However, shape memory alloys exhibit a different behavior. This behavior establishes the alloy as highly valuable for medical applications, including bone implants, orthodontic arch-wires, orthopedics, artificial joints, cardiac stents, and internal treatments. Shape memory alloys are generally categorized into: nickel-titanium alloys, copper-based alloys, and iron-based alloys. Nickel-titanium shape memory alloy is one of the most important and practical materials for medical implants due to its low density, which allows for the creation of lighter and stronger structures. The elastic modulus of these alloys is close to that of bone, which means they do not cause a stress-shielding effect; consequently, bone cells remain intact. This article emphasizes the exceptional properties and benefits of the NiTi alloy, demonstrating its potential as a remarkable metallic biomaterial.