The document discusses the differences and relationships between internal auditing and external auditing. It notes that internal auditing provides independent assurance to improve an organization's operations, while external auditing expresses an opinion on the organization's financial statements. Both aim to evaluate risk management and controls, but internal auditing focuses more on operational auditing, while external auditing examines historical financial data. There can be a cooperative relationship between the two, with internal auditors providing expertise and information to external auditors, but external auditors ultimately maintain independence and sole responsibility for the audit opinion.