When tackling software development, it's crucial to differentiate between a High-Level Design ( Top-Level Blueprint) and a Low-Level Design ( Detailed Specification ). The HLD paints a broad picture of the system’s components and their relationships , focusing on the “what” and “why”. Essentially

The fundamental difference between a HLD and a Low-Level Design lies in their level of detail . The HLD provides a bird's-eye view, outlining the significant components, their interactions, and the overall system approach . It focuses on "what" needs to be accomplished – defining the architecture