In our everyday experience, we perceive and interact with three spatial dimensions: length, width, and height. These dimensions are often referred to as the three dimensions of physical space or simply as three-dimensional space. They provide a framework for describing the position, size, and shape of objects in our environment.
The three dimensions can be represented by a coordinate system, such as the Cartesian coordinate system, where each point in space is identified by three numerical values that correspond to its position along the three axes: the x-axis (horizontal), the y-axis (vertical), and the z-axis (perpendicular to the ground).
It's worth noting that in certain branches of theoretical physics, such as string theory and M-theory, additional dimensions beyond the three spatial dimensions of our everyday experience are proposed. These extra dimensions, often referred to as "compactified dimensions," are hypothesized to be curled up or hidden at extremely small scales, beyond our current ability to observe or perceive them directly. However, their existence is still a subject of ongoing scientific research and exploration.