Question

what is half cell in short form​

Answer 1

A half-cell is half of an electrolytic or voltaic cell, where either oxidation or reduction occurs.

Answer 2

A half cell is one of the two electrodes in a galvanic cell or simple battery. For example, in the Zn−Cu battery, the two half cells make an oxidizing-reducing couple. Placing a piece of reactant in an electrolyte solution makes a half cell.