The Logical Building Blocks
These layers are described below:
1) The Presentation Layer:
It is also called as the client layer or Presentation Layer or Graphical User Interface (GUI) layer comprises of components that are dedicated to presenting the data to the user. For example: Windows/Web Forms and buttons, edit boxes, Text boxes, labels, grids, etc.
2) The Business Layer:
This layer encapsulates the Business rules or the business logic of the encapsulations. To have a separate layer for business logic is of a great advantage. This is because any changes in Business layer can be easily handled in this layer. As long as the interface between the layers remains the same, any changes to the functionality/processing logic in this layer can be made without impacting the others.
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