There are a large number of special terms used to describe electrochemical cells which need to be understood to be able to read about such cells

An electrochemical cell can run in two directions: the spontaneous direction, in which case electrical energy is generated, and in reverse if an external voltage is applied. The terms volatic and electrolytic refer to these types of cells

• Voltaic: A cell where a spontaneous reaction is taking place: it generates electrical energy
• Electrolytic: A cell where a non-spontaneous reaction occurs by running electrical energy through it.

Inside a cell, a reduction-oxidation reaction is occuring. Each cell has two electrodes, an anode and a cathode

• Anode: the electrode at which oxidation is taking place
• Cathode: the electrode where reduction is taking place

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