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NeXus is a data format for experimental science that is commonly used in the neutron, x-ray, and muon scientific communities. It is being developed as an international standard by scientists and programmers representing major scientific facilities in Europe, Asia, Australia, and North America in order to facilitate greater cooperation in the analysis and visualization of scientific data. Technically, NeXus is a data model rather than a file format, because it describes how data should be organised and structured within a file and has little to say about how that data is encoded for storage. A NeXus file can be mapped into many different container formats, though the preferred and best supported backend is HDF5. XML is used for demonstration purposes mainly.