Orthographic projection is a method of representing three-dimensional objects in two dimensions. It is a form of parallel projection in which all the projection lines are orthogonal to the projection plane, resulting in every plane of the scene appearing in affine transformation on the viewing surface. Orthographic projection is commonly used in engineering, architecture, and design to represent three-dimensional objects by three two-dimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawing. The three views of an orthographic projection are the front view, the top view, and the side view. Orthographic drawings are also known as multi-views, and they help to show the details of an object that a 3D drawing cannot. Orthographic projection is different from oblique projection, which is a parallel projection in which the projection lines are not orthogonal to the projection plane.