The term "Cardassian" refers to a fictional alien species from the Star Trek universe. They are known for their distinctive appearance, characterized by prominent facial ridges and a grayish skin tone. Cardassians are often depicted as a militaristic and authoritarian society, with a complex history involving conquest and oppression. In the Star Trek series, particularly in Star Trek: Deep Space Nine, Cardassians play a significant role as antagonists. Their government, the Cardassian Union, is known for its oppressive regime and surveillance tactics. The species is also notable for its intricate culture, which includes a strong emphasis on loyalty and honor.