Academic users may also have free on-line access to a number of databases. Commercial database hosts offer access to very many databases. There are differences between the host in the databases offered. Moreover, each host will have a different search language and there will also be differences in the search facilities offered. Access through a commercial host can be expensive.
Some databases are freely available on the Internet.
These include important resources such as Medline and its associated databases, which have been made freely accessible as a result of the freedom of information policy adopted by the US Government. Listings of free databases Listings of commercial databases and database hosts PREX PREX is a non-profit database host based at the University of Utrecht. The focus of PREX is on veterinary science, animal welfare and alternatives to laboratory animals. PREX users are able to interrogate the databases and download records at no further charge except for normal telephone charges.