An affinity electrode is a type of electrode that is designed to detect specific molecular structures by using a high affinity coating. There are a variety of synonyms for affinity electrodes such as biosensors, chemical sensors, and molecular sensors. Additionally, some specific types of affinity electrodes include immunosensors, enzyme sensors, and DNA sensors. These different variations of affinity electrodes are differentiated based on the specific type of coating or recognition element that they use to detect target molecules. Regardless of the specific type, all affinity electrodes have one thing in common: they are incredibly sensitive and accurate sensors that are essential for research in biomedical, environmental, and food analysis fields.