Biological databases are repositories of life science information presented in organized manner. They are required for a variety of purposes by
researcher, scientists and educators.
In general they are accessible via the Internet where you can retrieve biological information using, for instance, a keyword.
Some biological databases contain information for many other and are named integrated, likewise GeneCards, where you found links to many other databases:
UniProt / Swissprot where you obtained information for the protein encoded by the OPN1LW gene
PubMed with access to different scientific papers related with OPN1LW gene
OMIM with access to genetic diseases caused by mutations in OPN1LW gene
HGMD where you learned what kinds of mutations are already known for this gene
The vast majority of biological databases are cross linked.
One area of research in bioinformatics is related to the acquisition, organization and storage of biological data in order to be used by Scientists,
Physicians, Pharmaceutical Industry, Science Education and general population.