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Robustness is the robust quality. This adjective, which comes from the latin robustus, refers to what is vigorous, strong or solid. Examples: "this is a car of a sturdiness to travel thousands of kilometres without problem", "the strength of the team has suffered with the departure of Vokachik", "For a business to have the strength, the thing most important is to have a good financial reserve".
Robustness can refer to physical or symbolic characteristics. A building which is still standing centuries proves its robustness to have stood the test of time. This may be possible by the quality of the materials and the expertise of builders. However, if the construction starts to have structural failures five years after having been built, no one can highlight its robustness because it is a weak and fragile construction.
A computer system, can also boast of its strength if it is able to run multiple processes simultaneously without generating errors or lockups. An example of robust system is one that is intended for the creation of 3D graphics for working with very large images without problems. The program hangs when loading the first image, is that it is a little robust application.
As can be seen from these examples, strength does not always refers to material (or material). A robust construction requires physical components that enable it to have this quality, but a computer program (or software) with the same adjective takes this designation because of the type of programming or its management of digital information.