Grid lines are an essential tool in design that helps create a consistent and balanced layout. They act as a guide for aligning elements such as text, images, and graphics, making the design look clean and organized. By using grid lines, designers can achieve a sense of order and hierarchy in their work. Grids can be customized to suit the design’s needs, including the number of columns, margins, and gutters. The use of grids can also help designers work more efficiently and quickly, as they can easily position and adjust elements with precision. Overall, grid lines are a valuable asset in design that can help create professional-looking and visually appealing work.