What is a 3-tier application architecture? Definition and Examples

The 3-tier architecture is a prevalent model in software development that divides applications into three layers: presentation, logic, and data, each serving distinct roles. This structure enhances scalability, maintainability, flexibility, and security by allowing each tier to operate independently, making it easier to update or replace technologies without affecting the entire application. Applications using this architecture can handle increased demand by scaling individual tiers, improve security through layered protection, and benefit from developer specialization, as teams can focus on specific tiers. Real-world examples include e-commerce websites, content management systems, and customer relationship management systems, where each layer has defined responsibilities. vFunction, a modernization tool, aids developers and architects by providing insights into application architecture, identifying technical debt, and offering recommendations for improving performance and resiliency, ensuring that 3-tier applications remain efficient and adaptable.