What is an electrode?

An electrode is a connection point, which can be an electrically conductive rod, wire, plate, or other surface that is in direct contact with a non-metallic part of a circuit system. It conducts current to or from a substance, ranging from liquids to gases. Electrodes are commonly used to connect electric current to and from an electrolyte, an electrochemical system, or an electrical device.

Electrodes are an essential part of various things - including batteries, electrochemical reactions, sensors, measurements in medical equipment, etc. Depending on the application, electrodes can be made of various materials, such as metals like copper, aluminum, or platinum. Electrodes can also be coated with specific materials to achieve desired properties or reactions in the system they are part of.