Electrochemical reaction: Reaction involving charged species in solution. Example; acid base reaction, precipitation, complexation, oxidation reduction
Ectrochemical cell: construction of electrochemical cell using two electrode that allows study of cell reaction, changes in concentration and electrolysis.
Electrode potential: potential difference between two electrode depends on properties of electrode and concentration in solution.
Electrolysis: if cell reaction is driven by applying external voltage supply, then useful chemical reaction may occur.