What are predatory journals?
Predatory journals are journals whose sole purpose is to make money, not advance science. They do this by getting people to publish through questionable marketing tactics such as email spamming and false promises. After a person decides to publish in a predatory journal, the person is charged high fees, and after all of the fees are paid, the article is published with little or no oversight.
How to tell if a journal is a predatory journal:
How to Assess a Journal by the Canadian Association of Research Libraries: