web tier vs application tier

What is 2 tier and 3 tier web application?
The two-tier DB architecture is a client-server architecture.
The three-tier DB architecture is a type of web-based application.
It contains mainly two layers- the Data Tier (Database Tier), and the Client Tier.
It mainly contains three layers- the Data Layer, the Business Layer, and the Client Layer.
What are application tiers?
The application tier, also known as the logic tier or middle tier, is the heart of the application.
In this tier, information collected in the presentation tier is processed - sometimes against other information in the data tier - using business logic, a specific set of business rules.
Modern web apps still use the 3 tier architecture concept, which separates applications into presentation tier, application tier, and data tier.
Within the 3 tier web application architecture, each layer runs on its own infrastructure, and can be developed in parallel by different teams._{23 jan. 2024}

What is the difference between application tier and data tier?

The data tier stores information, the application tier handles logic and the presentation tier is a graphical user interface (GUI) that communicates with the other two tiers.
The three tiers are logical, not physical, and may or may not run on the same physical server.

The web tier offers a graphical user interface (GUI), which displays information to and collects information from the users. The application tier handles the business logic and processes user inputs. The database tier is where the information is stored and managed.

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3-Tier Application Structure - Institute of Applied Optimization - 合肥

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