While some databases in the library are freely available on the internet, such as PubMed, always use one of the custom links found on the Library Homepage or another library guide page to get to the databases.
This will allow you to get access with your eRaider credentials. This gives you more access to the databases for free, and often includes other database options that you would not see as a non-library user.
You will need your eRaider credentials to access library resources from off-campus.