Definition:Â A collection of related data arranged in a way suitable for adding, locating, removing and modifying the data.
The database which store biological data is called biological database Eg: nucleotide sequence data base
 DNA sequence databases:
Protein databases:
The database which store biological data is called biological database Eg: nucleotide sequence data base
 DNA sequence databases:
- Genbank of (National Center For Biotechnology Information)
- DDBJ:DNA Data Bank of Japan
- EMBL/EBI: European Molecular Biology Laboratory/European Bioinformatics Institute
Protein databases:
- SWISS-PROT
- PIR: Protein Information Resource
- TREMBL: Translated EMBL
- PDB: Protein Data Bank