: Internal logic of individual components, including classes, methods, data structures, and specific algorithms. Responsibility : Created by Designers and Developers . Input : The approved High-Level Design.
: Overall system architecture, technology stack, and major modules (e.g., Database, UI, Security). SDLC: - Software Development Life Cycle HLD LLD
: Typically created by Solution Architects or senior developers. Input : Software Requirement Specification (SRS). : Internal logic of individual components
: 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 and major modules (e.g.
HLD serves as the architectural roadmap, defining "what" the system will do and how its major parts connect.