This document provides an introduction and overview of auditing. It defines key terms like auditing, attestation, and assurance services. Auditing involves obtaining and evaluating evidence to determine if financial statement assertions match established criteria. Attestation involves issuing reports on subject matter prepared by other parties. Assurance services improve information quality for decision makers. The audit process involves accepting clients, planning, considering controls, testing processes, completing tests, and issuing opinions. Auditors use sampling to examine transactions due to limited resources. Logic, reasoning, and innovation are important skills for auditors.