Scar tissue is made of collagen fibers, just like the rest of your skin. The main difference lies in how these fibers are arranged. Scar tissue has a look and feel that is thicker than the rest of your skin because the collagen is produced as a disorderly mass of fibers.
A pre-order is an order placed for an item which has not yet been released. The idea for pre-orders came when people found it hard to get popular items in stores due to their popularity. Companies then had the idea to allow customers to reserve their own personal copy, before the release, which has been a huge success.
Previsualization (also known as previs, previz, pre-rendering, preview or wireframe windows) is a function to visualize complex scenes in a movie before filming. It is also a concept in still photography. Previsualization is applied to techniques such as storyboarding, either in the form of charcoal drawn sketches or in digital technology in the planning and conceptualization of movie scenery make up.