What do the letters and numbers mean on a light bulb base?

The letters and numbers on a light bulb base indicate its type, size, and specifications. For example, "E26" represents an Edison screw base with a diameter of 26 millimeters, commonly used in the U.S. "B22" refers to a bayonet base with a 22-millimeter diameter. Other markings may indicate wattage, voltage, or specific design features, helping to ensure compatibility with fixtures and electrical systems.