Dimension is one of the most important concepts in our daily lives because we live in a multi-dimensional world, but surprisingly, throughout our studies, we have never defined it explicitly. The concept of the dimension of a given object can be explained by a number of independent motion orientations of any point belonging to that object. For example, a point cannot move in any direction, and therefore, a point is 0. On any line or curve, the point can move forward or backward, and therefore, the dimension of a curve (or line) is 1-this is like a train on the tracks). The distance can move in two independent directions, and therefore, from dimension 2 (this is similar to the movement of a car on a plane - it can move in the direction of the x-axis or in the direction of the y-axis, but it cannot detach from the ground). When we look at the space, we get 3 possible motion directions for each point, and therefore, the dimension of space is 3 (it is similar to the movement of an airplane - it can move in 3 independent directions - in the direction of the x-axis or the y- z - meaning both up and down).