Predatory publishing poses a major threat to research integrity, exploiting pressures on academics to publish. This chapter reviews their deceptive practices, including hijacked domains, fake editorial boards, and the acquisition of legitimate journals. Vulnerable groups, especially early-career researchers and those in low-income countries, are disproportionately affected due to systemic inequalities. Ethical violations such as lack of transparency, conflicts of interest, and misuse of intellectual property are highlighted. Case examples, including OMICS and the SCigen hoax, demonstrate the absence of editorial scrutiny in dubious outlets. The chapter concludes by emphasizing the need for stronger global standards, ethical training, and equitable publishing opportunities to protect the credibility of science.