An internal auditor is someone who checks the internal control systems in an organisation – usually larger organisations. Staff typically fear the arrival of an external auditor, but at least they go away in a few weeks. The internal auditor is not only ever present, but knows a lot more about a business than any external person. Thus, in my own experience, internal auditors are perhaps less liked than external auditors. However, perhaps my experience was just a bad one. This articles from CGMA at least suggests that an internal auditor needs some decent communication and social skills to0.
(Image from CGMA)