A baseline grid is a design tool used in typography and layout to create a consistent vertical rhythm across a page. It consists of evenly spaced horizontal lines that guide the placement of text and other elements, ensuring that they align neatly. This alignment helps improve readability and creates a more organized appearance in printed materials or digital interfaces. Designers often use a baseline grid in conjunction with typography principles to maintain harmony in their layouts. By adhering to this grid, they can ensure that text blocks, images, and other components are visually cohesive, enhancing the overall user experience in various formats, such as web design or print media.