An electrochemical reaction is a chemical reaction that describes the overall reactions of individual redox reactions being separated but connected by an external electric circuit and an intervening electrolyte.
Oxidation is a chemical reaction that describes the loss of electrons of an atom, an ion, or of certain atoms in a molecule and is a part of a redox reaction.
Reduction is a chemical reaction that describes the gain of electrons of an atom, an ion, or of certain atoms in a molecule and is a part of a redox reaction.
A steam reforming process is a chemical reaction that converts hydrocarbons and steam to syngas. As it converts chemical energy and thermal energy to a different type of chemical energy (and waste heat), it is also an energy transformation process.