The primary purpose of a ruler is to measure length or distance accurately. Rulers, typically made of wood, plastic, or metal, are marked with units of measurement, allowing users to draw straight lines, measure objects, and perform basic geometric calculations. In educational settings, rulers serve to teach measurement concepts, geometry, and spatial awareness. Beyond their practical use in various fields such as engineering, architecture, and art, rulers exemplify precision and serve as essential tools in both professional and everyday contexts. Their straightforward design and functionality make rulers indispensable in numerous applications, from crafting to construction.