Interior design is the art and science of enhancing the interior of a space to achieve a healthier and more aesthetically pleasing environment. It involves a comprehensive understanding of architecture, furniture, color theory, and spatial arrangements to create functional and beautiful spaces. Interior designers work closely with clients to understand their needs and preferences, selecting appropriate furnishings, materials, and color schemes. They may also collaborate with architects and builders to ensure that the design aligns with the overall vision of the space, making it both practical and visually appealing.