What is the difference between tier vs layer application?

Question

Last week I was talking about the 3 tier architecture with my seniors. I was saying that it has a UI tier, Business Logic Tier and Data Access tier. After I have finished, h

Answer 1

Layers are conceptual entities, and are used to separate the functionality of software system from a logical point of view; when you implement the system you organize these layers using different methods; in this condition we refer to them not as layers but as tiers.