A nitride layer is a hard, protective coating formed on the surface of metals by introducing nitrogen atoms into the metal's structure, typically through a process called nitriding. This layer significantly increases the metal's resistance to corrosion, wear, and fatigue, making it highly valuable in industrial and manufacturing applications. The nitride layer is commonly used to enhance the durability of tools, machine parts, and components exposed to harsh environments. In the context of cybersecurity, the term may appear in discussions about the physical security of hardware, as devices with nitride layers are less susceptible to physical tampering or environmental damage, thereby helping to protect sensitive information stored on these devices.