Layer and Tier

[Shaik.Nazeer Ahmed]

what is difference between Layer and Tier ?

[Deepak Rao]

Kind of similar, Tier is a physical demarcation and Layer is a logical one.

The concepts of layer and tier are often used interchangeably. However, one fairly common point of view is that there is indeed a difference, and that a layer is a logical structuring mechanism for the elements that make up the software solution, while a tier is a physical structuring mechanism for the system infrastructure

-wikipedia

Thanks
Deepak

[Campbell Ritchie]

And welcome to the Ranch

[Kiran Yadav]

Yes, layer and tier are often used interchangeably, however in bussiness language perspective tier indicates the layered structure.