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

from wikipedia:

In software engineering, multi-tier architecture (often referred to as n-tier architecture) is a client–server architecture in which the presentation, the application processing, and the data management are logically separate processes

Tiers vs Layers is both a software and hardware related difference. There's a client-server divide or a logical layering. The boundaries for either concept depend on the responsibilities of each conceptual component of the architecture. For the most wellknown example of layering, see the OSI model.