Large software systems are complex applications that consist of many interconnected components. They are designed to perform a wide range of functions and can serve numerous users simultaneously. Examples include operating systems, enterprise resource planning (ERP) software, and cloud computing platforms. These systems often require extensive planning, development, and maintenance to ensure they operate efficiently and securely. To manage their complexity, large software systems typically use modular design, allowing different parts to be developed and updated independently. They often rely on various programming languages, frameworks, and tools to facilitate collaboration among developers. Additionally, version control systems are commonly used to track changes and manage code effectively.