Biotechnology was technology that involved biological systems, living organisms, or derivatives, engineered for agriculture, food science, medicine, or another specific use.
The Cardassians used biotechnology and implanted cranial implants into the skulls of former operatives of the Obsidian Order. In 2370, Elim Garak experienced the results of this procedure and charged Quark with providing him with information and the schematics of this device. Quark contacted Glinn Boheeka and gave him the access code, followed by the discovery of his attempt to get the classified information and the ruin of his career. (DS9: "The Wire")