This document provides an overview of SOC1, SOC2, and SOC3 reports and guidance on their application. It discusses the different types of SOC reports and what they cover, such as internal controls over financial reporting (SOC1), security, availability, and confidentiality (SOC2), and shorter reports for general distribution (SOC3). The document also contrasts the scope and level of detail provided by SOC1, SOC2, and SOC3 reports and considers their applicability to different types of outsourced services. It provides leading practices for both users and service providers in adopting SOC reports.