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Structure is a fundamental and sometimes [intangible] notion covering the [recognition] , [observation] , [nature] , and [stability] of [pattern] s and [relationship] s of [entities] . From a child's verbal description of a [snow] flake, to the detailed [scientific analysis] of the properties of [magnetic field] s, the concept of structure is an essential foundation of nearly every mode of inquiry and discovery in [science] , [philosophy] , and [art] .

A structure defines what a [system] is made of. It is a configuration of items. It is a collection of inter-related components or services. The structure may be a hierarchy (a cascade of one-to-many relationships) or a network featuring many-to-many relationships.

Types of structure
Biological structure
In [biology] , structures exist at all levels of organization, ranging hierarchically from the [atom] ic and [molecular] to the [cellular] , [tissue] , [organ] , [organism] ic, [population] and [ecosystem] level. Usually, a higher-level structure is composed of multiple copies of a lower-level structure.

Chemical structure
Chemistry is the science treating matter at the atomic to macromolecular scale, the reactions, transformations and aggregations of matter, as well as accompanying energy and entropy changes during these processes. The [chemical structure] refers to both molecular geometry and to electronic structure. The [structural formula] of a chemical compound is a graphical representation of the molecular structure showing how the atoms are arranged. A [protein structure] is the three dimensional coordinates of the atoms within (macro) molecules made of protein.

Built structure

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