System integration involves connecting various systems, typically SaaS applications, to allow the free sharing of data, which can enhance efficiency and reduce errors in organizational workflows. This process can be categorized into internal integrations, customer-facing integrations, business-to-business (B2B) integrations, and enterprise service bus integrations. Benefits of system integration include time savings, fewer errors, increased employee satisfaction, higher business close rates, and market expansion opportunities, although challenges such as integration performance issues, difficulties in scaling, and securing partnerships with third-party providers can arise. Tools like Integration Platform as a Service (iPaaS), Robotic Process Automation (RPA), and unified API solutions can facilitate these integrations, each offering unique advantages and potential drawbacks. Merge, a leading unified API solution, offers a comprehensive platform for managing integrations and providing robust integration observability, maintenance support, and advanced features.