The document discusses the National Center for Biotechnology Information (NCBI). It provides background that NCBI is part of the National Library of Medicine and houses databases relevant to biotechnology and biomedicine. It describes some of NCBI's major databases, including GenBank for DNA sequences and PubMed for biomedical literature. The document also discusses the BLAST tool and provides examples of some of NCBI's databases, such as the Nucleotide, Protein, and Structural databases.