what is 4d

In mathematics, 4D refers to the mathematical extension of the concept of three-dimensional space. Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe it. The fourth dimension is related to the other three dimensions of length, width, and depth by imagining another direction through space. In physics, 4D refers to the idea of time as a fourth dimension, added to the three spatial dimensions. The difference is that spacetime is not a Euclidean space, but instead is called "Minkowski spacetime". It is difficult to visualize or even picture 4D technology and objects, and the best method is to compare 2D images and 3D models. Some professionals have used the "fourth dimension" to refer to adding more effects to forms of media that three dimensions cant accommodate.