Question: what is the difference between one and two dimensions?
Answer: It have two motions of 1D, in which, they are orthgonal to each other. The world of the 2D system will be a plan (x,y). The best example will be the car on the road or any motion on a plan. 3D: It have three motions of 1D, in which, the 3rd dimension is orthogonal to the 2D plan.