A 4-Dimensional Space is a space in which each point requires a quadruplet of numbers to describe its position. Examples of 4-dimensional spaces include a space with 3 spatial dimensions and 1 dimension used to find extents in our universe, spaces required to represent quaternions or coquaternions, and 4-manifolds with special curvatures.
Types of 4-Dimensional spaces
Examples of 4-dimensional spaces are listed below
A Euclidean flune is a four-dimensional space with zero curvature. It is a flune that follows the postulates of Euclidean geometry.
A hyperbolic flune is a four-dimensional flune with negative curvature.
A verse with four dimensions is called a fluneverse. Spatiotemporally, our universe is thought to be a fluneverse, though models of string theory made for phenomenology require more dimensions in our universe (multiverse, if you consider our universe to be the space localized on a D3 brane) to be consistent.