General databases with some coverage of all subject areas.
The Library has hundreds of databases; you can find the ones best for your subject area here.
This 2-minute video explains how to turn your topic into keywords that you can use to search library databases.
Search the PSU Library Catalog for articles in selected databases. This screenshot of a journal article citation shows that you can access the article full text by selecting the green link, Online Access. Sign into the PSU Library catalog to access the article. Note that the article can be available in more than one database.