Predatory publishers, or low-quality publishers, use a variety of means to persuade or extort authors to publish in their journals but they are not reputable, tend to have below-average citation rates, and contribute little to overall science. They use techniques that may not be readily detectable so educate yourself to identify them and avoid publishing with them.
Center for Open Science definition of predatory publishing:
“Predatory journals and publishers are entities that prioritize self-interest at the expense of scholarship and are characterized by false or misleading information, deviation from best editorial and publication practices, a lack of transparency, and/or the use of aggressive and indiscriminate solicitation practices.”
Journal title or publisher is unfamiliar
Lures you in with a too-good-to-be-true offer
Journal title may sound highly respectable
Article submission costs are not transparent
Uses address in prominent city
Editorial board claims prominent university/research institution affiliation
Review system is unclear
Journal title not present in Directory of Open Access Journals or other indexes commonly used
Publisher should be listed in one or more directories for ethical publishers such as: