H5 files store data in HDF (Hierarchical Data Format). H5 files are used to store numerical, graphical, or text data. H5 files are sometimes referred to as data libraries.

H5 format is used by many sectors, including aeronautics, or sciences branches, such as astronomy, medicine, finance, physics. Such files are also used for academic and educational purposes. Full list of compatible software can be found on HDF Group website.