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🖥️ Client-Server Architecture

  1. In this model, multiple clients (users or devices) interact with a centralized server to access data, resources, or services.

Types​

Two-Tier​

  1. Here, the client directly interacts with the server.
  2. The server typically handles both application logic and data management.
  3. Simple but inefficient as the number of clients increases.
  4. Example: A desktop app that directly connects to a DB server to retrieve and show data (e.g., MongoDB Compass).

Three-Tier​

  1. Here, databases are handled on a different server.
  2. Client → App Logic Server → DB Server
  3. Example: A web app which follows this model.

N-Tier​

  1. Extension of the 3-tier model, where additional layers can be caching, load balancing, security, etc.

Advantages​

  1. Centralized management
  2. Scalability
  3. Resource sharing
  4. Security

Challenges and Considerations​

  1. SPOF (Single Point of Failure) – If the server is down, all clients will be affected.
  2. Complex to manage