Linked from
The 9 pages that link to Reducing agent, each with the reason it gives.
Oxidizing agentCompared with: It supplies the electrons that the oxidizing agent accepts.
ReductionRelated: Its electron donation causes another substance to be reduced.
Half-reactionCompared with: It supplies electrons in oxidation, but is not itself the half-reaction.
ReagentRelated: Reducing reagents deliver electrons to other substances.