A T-square is a tool commonly used in drafting and technical drawing. It consists of a long, straight edge with a shorter perpendicular bar at one end, resembling the letter "T." This design allows users to draw precise horizontal lines and create accurate angles, making it essential for architects and engineers when creating blueprints or plans. In addition to its use in drafting, a T-square can also help students learn about geometry and spatial relationships. By using a T-square alongside a triangle or protractor, learners can better understand concepts like angles and parallel lines, enhancing their overall comprehension of mathematics and design.