three-dimensional space
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Three-dimensional space is a geometric model where any point's location is specified using three parameters, typically represented as length, width, and height. It matters because it describes the physical space we experience and move through in the real world, making it fundamental to fields like physics, engineering, and architecture.
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A representation of a three-dimensional Cartesian coordinate system
In geometry, a three-dimensional space is a mathematical space in which three values (termed coordinates) are required to determine the position of a point. Alternatively, it can be referred to as 3D space, 3-space or, rarely, tri-dimensional space. Most commonly, it means the three-dimensional Euclidean space, that is, the Euclidean space of dimension three, which models physical space. More general three-dimensional spaces are called 3-manifolds. The term may refer colloquially to a subset of space, a three-dimensional region (or 3D domain), a solid figure.