Logic Tier

In short: The logic tier (application layer) is the middle layer of the three-tier architecture and contains the business logic.

In more detail: It mediates between the presentation tier and the data tier.

In Depth

Tasks

Apply rules, check data, control processes, coordinate transactions. Also called “application tier” or “middle tier”.

Advantage

Separate layers can be changed, tested and scaled independently. See business logic, backend.

See also: Business Logic, Presentation Tier, Data Tier, Backend