noun
substitute; proxy; representative; agent
Refers to a person who appears, acts, or handles a matter in place of someone else. Often overlaps with 代理人, which is the more explicit term for a legally or formally authorized agent.
本人が出席できない場合は、代人を立てることができます。
If the person cannot attend, they may appoint a proxy.
彼
He attended the meeting as the president's representative.
Means a representative of a group or organization; 代人 usually means someone substituting for a particular person.
A Sino-Japanese compound conventionally combining 代, 'substitution' or 'acting in place of,' with 人, 'person.'