How can one define the Ombudsman institution?

The International Ombudsman Institute gives this classical definition:-

“The Ombudsman institution is an office established by constitution or statute, headed by an independent high-level public official who receives complaints about injustice and maladministration from aggrieved person against government agencies, officials, employees or who acts on his/her own initiative. The Ombudsman has powers to investigate, criticise, recommend corrective actions and generally to publicise administrative actions. The Ombudsman as an individual is a person of prestige and influence who operates with objectivity, competence, efficiency and fairness. He/she uses fast, inexpensive and informal procedures, is easily accessible and has no powers of sanction”.