Three-Tier Architecture Overview

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Three-Tier Architecture Overview

A three-tier architecture is a software design pattern that organizes applications into three logical layers, improving scalability, maintainability, and security. Each layer has a distinct role:

1. Presentation Layer (Frontend)
• The user interface (UI) that interacts with users.
• Can be a web app (React, Angular, Vue.js), mobile app, or desktop app.
• Communicates with the application (business) layer through HTTP, APIs, or other protocols.
2. Application Layer (Business Logic / Backend)
• The core logic of the application, where data is processed.
• Implements business rules and workflows.
• Typically built with Node.js, Python (Django, Flask), Java (Spring Boot), .NET, Ruby on Rails, etc.
• Connects to the database and communicates with the frontend via APIs (REST, GraphQL, gRPC).
3. Data Layer (Database / Storage)
• Stores and manages data securely.
• Includes relational databases (MySQL, PostgreSQL, SQL Server) or NoSQL databases (MongoDB, DynamoDB, Cassandra).
• Can involve caching mechanisms like Redis or Memcached for performance improvement.

Diagram Representation. 

# java

Advantages of Three-Tier Architecture
Scalability – Each tier can be
scaled independently (e.g., load balancers, microservices).

Maintainability – Code is modular, making updates and fixes
easier.

Security – Business logic and data are isolated from the
frontend, reducing exposure to attacks.

Flexibility – Different technologies can be used for each tier
(e.g., a Node.js backend with a React frontend).
Deployment in Cloud & DevOps
Frontend → Deployed on
     AWS S3 + CloudFront, EC2, or Kubernetes
 
Backend → Hosted on
     AWS Lambda, EC2, ECS, Kubernetes
Database → Hosted on
     RDS (MySQL, PostgreSQL), DynamoDB, or
     managed NoSQL solutions

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