The databases contain citations and full-text articles.
A citation is only a little bit of information about the article - the title, author(s), where it was published, and perhaps an abstract. A citation will not give you much information, and it is not acceptable to use just the abstract as a reference source.
If you see an article like the example below, you are looking at a citation, not a full-text article:
Therefore, you should limit your search to full-text articles. You can do that before or after you search.
If you want to limit before you search, check the Full Text checkbox underneath the Limit Your Results section:
Or if you forget to check the box before you search, you can also check it after you get a list of results. The checkbox appears at the top left of your results:
With all that said, though, if you find an article in the database that does not have the full text included, but you think you'd like to read that article, contact a librarian. We can order it for you - for free - through interlibrary loan.