what is the difference between one and two dimensions?
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.