What is the purpose of a legend on a drawing?

The purpose of a legend on a drawing is to explain symbols and markings. A legend serves as a key that provides clarification about various symbols used throughout the drawing, helping viewers understand what each symbol represents. This is particularly important in technical drawings, such as electrical or architectural plans, where various symbols indicate specific components, systems, or features. Without a legend, interpreting the drawing might be challenging, as symbols may not be universally known or understood. By clearly defining these symbols, the legend enhances the overall readability and usability of the drawing, allowing anyone who examines the plans to easily grasp the information they convey.