Libraries purchase databases which index journal articles and often provide full-text copies of those articles. Although purchased databases are accessed through the internet, they are not "internet sources" or "websites." Instead, think of these sources as products designed to facilitate academic research. Because they are purchased, they are not freely available to the public.
Sources other than licensed databases are freely available via Google or other search engines. These may, or may not, be the kind of information that can be used for a research paper. You should carefully evaluate these sources using the guide offered in the box on the right.
CRAAP is a set of easy-to-use (and remember!) criteria for evaluating your sources, including websites. Take a look at the worksheet and video below to learn how to apply these criteria.