: The LLD for a chat app would specify using AES encryption for messages and defining exact database columns like Message_ID and Timestamp . Comparison Table: HLD vs. LLD SDLC: - Software Development Life Cycle HLD LLD - image
The of the Software Development Life Cycle (SDLC) is where business requirements are transformed into a technical blueprint . This phase is split into two critical stages: High-Level Design (HLD) and Low-Level Design (LLD) . High-Level Design (HLD): The Macro View SDLC: - Software Development Life Cycle HLD LLD
LLD provides the detailed "how" of the system, acting as a direct guide for developers to write code. : The LLD for a chat app would
: Overall system architecture, technology stack, and major modules (e.g., Database, UI, Security). and major modules (e.g.