Citation cartels are groups of researchers who excessively cite each other's work to artificially inflate their citation counts and enhance their reputation. The practice of the citation cartel involves journals agreeing to cite each other's publications to boost their own impact factors. The citation cartel has been criticised for distorting the impact factors of participating journals and undermining the integrity of the scientific process. Citation cartels can take many forms, including reciprocal citing, where researchers agree to cite each other's work in exchange for citations. Citation cartels often involve a small group of researchers who are closely connected and who may be deliberately hiding their activities. To combat citation cartels, journals should use software tools to identify patterns of suspicious citing behaviour and should implement policies that encourage transparency and discourage self-citation. Journals should be held accountable for unethical citation practices, and researchers should carefully evaluate before submission. Key Words: Citation, Citation index, Self-citation, Impact factor.