GraphML
GraphML is an XML-based file format for describing graphs (networks), including nodes, edges, and their attributes, used for storing and exchanging graph data in applications like network analysis, social networks, and bioinformatics. It provides a standardized, extensible way to represent structural and application-specific data, supporting directed, undirected, and mixed graphs with hierarchical and hypergraph features.
Developers should learn GraphML when working with graph-based data in tools like Gephi, Cytoscape, or network libraries, as it enables interoperability and data exchange between different graph analysis platforms. It is particularly useful in fields like social network analysis, where standardized formats facilitate sharing complex network datasets, and in software that requires persistent storage of graph structures with rich metadata.