Predatory journals prioritize self-interest over scholarship. They do not conduct proper peer review and instead offer quick publication for a fee without editing. In contrast, legitimate open access journals maintain high standards. It is important to check if a journal is indexed in reputable databases like DOAJ or has an impact factor from JCR. Potential predatory journals can be identified using lists from Beall's or Cabell's. Librarians can help determine if a journal is predatory by investigating the publisher, editorial board, and review process.