N-Tier Architecture

Definition:

N-Tier Architecture is a software design pattern that separates an application into multiple logical layers (tiers), where each tier has a specific responsibility and communicates only with adjacent tiers. This promotes separation of concerns, scalability, and maintainability.

Key Characteristics 🔄 Layered Structure: Each tier serves a specific function 📡 Inter-tier Communication: Tiers communicate through well-defined interfaces 🎯 Separation of Concerns: Business logic, data access, and presentation are separated 📈 Scalability: Each tier can be scaled independently

Example:

• 3-Tier Architecture:

┌─────────────────────┐
│   Presentation      │ ← User Interface (Web/Mobile/Desktop)
│      Tier           │
├─────────────────────┤
│    Business         │ ← Business Logic & Rules
│   Logic Tier        │
├─────────────────────┤
│    Data Tier        │ ← Database & Data Storage
└─────────────────────┘

• 4-Tier Architecture:

┌─────────────────────┐
│   Presentation      │ ← Frontend (React, Angular)
├─────────────────────┤
│   Application       │ ← Web Server (APIs, Controllers)
├─────────────────────┤
│   Business Logic    │ ← Business Rules & Processing
├─────────────────────┤
│    Data Tier        │ ← Database (MySQL, PostgreSQL)
└─────────────────────┘

Real-World Example: E-Commerce Application