• Presentation, processing, Data storage / retrieval are split into separate tiers
  • Presentation tier: How the data is presented to the user
  • Application tier: The application logic / functions of the application
  • Data Storage / Retrieval tier: How the data is structured, stored, retrieved and updated
  • The Client (eg. Browser, stand alone client) is sometimes considered a fourth tier
  • Advantages
    • One tier can to be updated without impacting other tiers
    • Scaleable
    • Extensible
    • Division of labour
    • Reuseable

This is a typical three – tier architecture. These tiers can be further sub-divided into more tiers, hence the name “n-tier”.

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