What is System Design?
System design is the process of defining the architecture, components, modules, interfaces, and data for a system to satisfy specified requirements. It bridges the gap between problem definition and detailed implementation, focusing on how individual components interact to form a cohesive whole.
In software engineering, system design is crucial for building applications that can handle real-world demands. Unlike low-level coding, it emphasizes high-level planning to ensure the system is scalable, reliable, and maintainable.
For example, consider designing a simple e-commerce website. System design would involve deciding on the database structure for user data, the API endpoints for product searches, and how to handle traffic spikes during sales events.
Key aspects include:
- Identifying functional requirements (e.g., user login, product catalog).
- Non-functional requirements (e.g., response time under 200ms, 99.9% uptime).
- Trade-offs, such as choosing between SQL for structured data or NoSQL for flexibility.