Illustrators create drawings and designs for books and magazines, advertisements, film, television and multimedia. Illustrators work on paper, and two-dimensional (2D) and three-dimensional (3D) models. They may use traditional or computer-based techniques, or a combination of both. Illustrators can specialise in illustrations for websites, phone apps, augmented reality development, magazines, children's books, scientific work, technical manuals, fashion and product packaging. Many work as freelancers. They may have to work very long hours when a deadline has to be met.