Inert gas refers to a group of gases that do not readily react with other substances due to their stable electronic configurations. Common examples include helium, neon, argon, krypton, and xenon. These gases are often found in the atmosphere in small amounts and are characterized by their lack of color, odor, and taste. Inert gases are used in various applications, such as in lighting, welding, and as protective atmospheres for chemical reactions. Their non-reactive nature makes them ideal for preserving sensitive materials and preventing unwanted reactions in industrial processes.