A component in an electronic or electrical device or device that is used as a conductive medium (solid, gas, vacuum, or electrolyte solution) to input or derive both ends of a current. One pole of the input current is called the anode or the anode, and the pole that discharges the current is called the cathode or the cathode. There are various types of electrodes, such as a cathode, an anode, a welding electrode, an electric furnace electrode, and the like.

The electrode in the battery generally refers to a position where a redox reaction occurs with the electrolyte solution. The electrode has positive and negative points. Generally, the positive electrode is a cathode, electrons are obtained, a reduction reaction occurs, and the negative electrode is an anode, and an electron is oxidized. The electrode may be a metal or a non-metal, and as long as it can exchange electrons with the electrolyte solution, it becomes an electrode.

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