Biological databases are centralized repositories of biological data, such as genetic sequences, protein structures, and gene expression profiles. These databases provide a wealth of information for researchers in fields such as genomics, proteomics, and bioinformatics, allowing them to access, search, and analyze large amounts of biological data for their research projects. Some commonly used biological databases include GenBank, UniProt, and the Protein Data Bank (PDB). These databases are essential tools for advancing research in the life sciences by facilitating data sharing, collaboration, and discovery.