Photo-crosslinking is a process that uses light to create chemical bonds between molecules, often in polymers or biological materials. This technique is commonly employed in fields like materials science and biomedicine to enhance the properties of materials, such as strength and stability. During photo-crosslinking, a light-sensitive compound, known as a photoinitiator, absorbs light and initiates a reaction that links adjacent molecules together. This method allows for precise control over the crosslinking process, enabling the creation of tailored materials for applications like hydrogels and 3D printing.