The Protein Data Bank (PDB) is a global repository that stores three-dimensional structures of biological macromolecules, primarily proteins and nucleic acids. Researchers can access this data to study the shapes and functions of these molecules, which are crucial for understanding biological processes and developing new drugs. Established in 1971, the PDB is maintained by the Research Collaboratory for Structural Bioinformatics (RCSB). It provides tools for visualization and analysis, allowing scientists to explore molecular structures in detail. The PDB plays a vital role in fields like biochemistry, molecular biology, and structural biology.