Seonglae ChoElectron donor
Reducing agent
In chemistry, a reducing agent (also known as a reductant, reducer, or electron donor) is a chemical species that "donates" an electron to an electron recipient (called the oxidizing agent, oxidant, oxidizer, or electron acceptor).
Examples of substances that are common reducing agents include the alkali metals, formic acid, oxalic acid, and sulfite compounds.
https://en.wikipedia.org/wiki/Reducing_agent
Electron donor
In chemistry, an electron donor is a chemical entity that donates electrons to another compound. It is a reducing agent that, by virtue of its donating electrons, is itself oxidized in the process.
https://en.wikipedia.org/wiki/Electron_donor