Design guidelines are a set of recommendations that help ensure consistency and usability in design projects. They cover various aspects, such as color schemes, typography, and layout, to create a cohesive look and feel. Following these guidelines can enhance user experience and make products more accessible. These guidelines are often tailored to specific industries or platforms, like web design or graphic design. They serve as a reference for designers, helping them make informed decisions that align with best practices and user expectations. Adhering to design guidelines can lead to more effective communication and a stronger brand identity.