"Predatory publishing" with reference to predatory journals and publishers has been defined as follows:
“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.”
Grudniewicz et al., Nature 576, 210-212 (2019)
It was first “diagnosed” and highlighted by a librarian, Jeffrey Beall, who coined the term in 2008. He subsequently drew up a list, which became known as Beall’s List, of publishers and journal titles he found to be indulging in this practice. This list ran until 2017 when it was removed without any official reason being given.
Besides predatory publishing, there are also predatory conferences. This guide provides some tips when considering invitations.