The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using electricity (electrolysis).

Electrochemistry is the scientific discipline studying the relationship between chemistry and electricity. It includes all technologies and techniques such as work on electrolysis, corrosion, batteries, fuel cells, accumulators, and electroplating.

In general, electrochemistry studies the relationship between chemical reactions and electricity. Electricity is the movement of electrons moving together in one direction. The chemical reaction that is happening in an electrochemical reaction will make electrons move from one side to another. These reactions are called oxidation-reduction reactions, meaning that electrons move between atoms. Some atoms are being oxidized, meaning that they lose an electron, and other atoms are being reduced, meaning that they gain an electron.