reducing agent (reductant)

Compare with oxidizing agent .A reducing agent is a substance that reduce another substance by supplying electrons to it. Reducing agents cause other substances to be reduced in chemical reactions while they themselves are oxidized. For example, tin(II) is a reducing agent in the following reaction: Sn2+(aq) + 2 Fe3+(aq) Sn4+(aq) + 2 Fe2+(aq)