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An HDF5 file (an object in itself) can be thought of as a container (or group) that holds a variety of heterogeneous data objects (or datasets). The datasets can be most anything:  images, tables, graphs, or even documents, such as PDF or Excel:

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The two primary objects in the HDF5 Data Model are groups and datasets.

There are also a variety of other objects in the HDF5 Data Model that support groups and datasets, including datatypes, dataspaces, properties and attributes.