HDF5 (Hierarchical Data Format version 5) is an open-source file format designed to store and organize large amounts of numerical data. It is particularly well-suited for scientific and engineering applications that generate massive datasets. HDF5 files can contain a variety of data types, including multidimensional arrays, tables, and images. The hierarchical structure allows for efficient organization and retrieval of data, making it easier to manage complex datasets. HDF5 supports metadata, which provides information about the data stored in the file, such as units, descriptions, and provenance. This metadata is crucial for understanding and interpreting the data. HDF5 is widely used in fields such as astronomy, climate science, medical imaging, and computational fluid dynamics. Its ability to handle large, complex datasets and its support for metadata make it a valuable tool for researchers and engineers.