What is the second dimension?

In a 1 dimensional space you would be able to see forward and backwards but not up/down or to the sides. Imagine like a infinitely thin thread. In a 2 dimensional world you would be able to see in front/behind and to the sides but not up or down. It would be like a piece of paper. We live in a three dimensional world. You can see up/down, infront/behind, and to the sides. The term "0th dimension", "dimension 0", etc., can refer to an infinitely small point in space, like a point on the thread earlier described.