Here are two databases that are useful in determining the importance of a journal. These databases track citations to determine how many scholars are citing articles from particular journals.
Predatory publishers charge processing fees for publishing, often under the guise of offering open access. However, these publishers don't use peer review or other quality checks, and the publications are not indexed in databases or the Directory of Open Access Journals (DOAJ). Predatory publishers often solicit faculty and graduate students who have presented at national conferences. However, there are ways to assess quality to make sure your work is being published in reputable journals.