A dimension is a measurable extent of a particular quantity, such as length, width, height, time, or space.
In physics, there are typically three dimensions of space (length, width, and height) and one dimension of time. However, there are theories that suggest there could be more than three spatial dimensions.
Dimensions are often described as perpendicular or orthogonal to each other, meaning they are at right angles. This allows for the unique measurement of each dimension without overlap.
It is difficult for humans to visualize more than three dimensions, as our brains are limited to processing information in three dimensions. However, mathematicians and scientists use mathematical models and theories to understand and study higher dimensions.
The fourth dimension is often referred to as time, as it is necessary for understanding and measuring change and movement in the universe. However, some theories suggest that there could be additional spatial dimensions beyond the three we are familiar with.