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A two dimenisional object is an object with just height and width, and without depth; therefore, 2D objects are flat. Due to the difficulty of scripting 3D projects in Scratch due to its lack of built-in 3D features, the majority of projects on Scratch are developed in 2D.
Most simple computer-generated images are 2D. 
Difference between 2D and 3D
3D objects have height, width, and depth, while 2D objects only have height and width. Objects in the real world are 3-dimensional, because they have depth. A drawing on paper is often 2D, but linear perspective is the process of creating a 2D image that appears to be 3-Dimensional. Computer graphics are all 2D, but can be made to appear 3-dimensional. A graphics processing unit is part of the computer that renders 2D and 3D images, commonly used in gaming.
2D on Scratch
When you open an example project or an example sprite on Scratch, it will be 2D. Scratch sprites and code can only create 2D projects unless a 3D technique, such as one using pen, is used. It is easier to make sprites and projects in 2D on Scratch because 3D projects require more coding as well as, in certain cases, trigonometry.
It is possible to make 3D projects on Scratch, but they are more complicated.