An ombudsman is an official appointed to investigate individuals' complaints against public authorities and resolve disputes, acting as an intermediary between the government and citizens. The document outlines that an ombudsman is independent of the three main organs of government and serves as a "tribune of the people" to protect citizens from injustice. The key functions of an ombudsman are to investigate complaints, act as a public assistant in disputes, and work to prevent graft while promoting fairness, good governance, and legal awareness.