Sutures are fundamental in hand surgery, providing necessary support for tissue alignment and fostering optimal healing in the intricately structured hand, which contains numerous tendons, nerves, and ligaments. This chapter emphasizes the evolution of suture technology, transitioning from traditional natural materials to modern synthetic and bioengineered solutions. It advocates for the importance of sutures in minimizing infection risks, reducing scarring, and enhancing recovery outcomes. It highlights innovations such as absorbable sutures and the potential for future advancements, including developing a conclusion for this paper on smart sutures that can monitor healing. From a biomechanical perspective, sutures serve as critical temporary scaffolds, requiring careful selection based on material properties and surgical techniques to withstand movement and effectively support tissue healing. A solid understanding of the distinct characteristics of various suture types—such as absorbable versus nonabsorbable and their tensile strength—is essential. Sutures can be classified based on their material structure, where monofilament sutures are made of a single thread. In contrast, braided sutures are made of multiple threads twisted or braided together, making them stronger. Braided sutures provide better knot security, whereas monofilament sutures provide better passage through tissues. This could prevent “fraying” in suturing situations where the ends of a suture thread start to unravel or separate into smaller strands, often occurring when tying knots, which can weaken the suture and compromise the wound closure due to poor knot security. Poor quality suture material, improper handling, or excessive tension applied during knot tying can cause suture failure. All these play a vital role in optimizing surgical results. This chapter also reviews comparative analyses of different suturing techniques and their biomechanical implications in flexor tendon repairs.