Field emission is a process where electrons are emitted from a material's surface when subjected to a strong electric field. This phenomenon occurs when the electric field strength is high enough to overcome the potential barrier at the surface of the material, allowing electrons to escape. Field emission is commonly observed in materials like metals and semiconductors. This process is utilized in various applications, including field emission displays and electron microscopes. In these devices, field emission enables the generation of focused electron beams, which are essential for high-resolution imaging and display technologies.