Graphlib is a JavaScript library for creating and manipulating graph data structures. It provides both directed and undirected graph implementations, enabling developers to model complex relationships between entities. The library offers functionalities for adding, removing, and querying nodes and edges, along with algorithms for traversing and analyzing graphs, making it suitable for various applications like network analysis, dependency resolution, and data visualization. Its focus on performance and flexibility makes it a valuable tool for projects leveraging graph-based data.