DC glow discharges are a type of electrical discharge that occurs in gases when a direct current (DC) voltage is applied. This process ionizes the gas, creating a plasma that emits light. The glow is typically observed in low-pressure gas environments, where the electric field can efficiently accelerate electrons, leading to ionization and the production of photons. These discharges are commonly used in various applications, including neon lights, plasma displays, and surface treatment of materials. The characteristics of the glow discharge depend on factors such as gas type, pressure, and applied voltage, making it a versatile tool in both scientific research and industrial processes.