Interior design is the art and science of enhancing the interior of a building or space to create a healthier, more aesthetically pleasing, and functional environment. It involves:

1. Space planning and layout
2. Color scheme and lighting design
3. Furniture and decor selection
4. Textiles and materials specification
5. Acoustics and sound quality improvement

Interior designers aim to balance form and function, creating spaces that are both beautiful and functional, while also meeting the needs and goals of the people using the space.