Business logic refers to the part of the program that encodes the real world business rules.

business logic ....refers to the domain specific logic rules,proc,and processes

presentation logic......concerned with how objects are displayed to the user of the software

MVC1 architecture combines business logic with the presentation logic, where as MVC2 seperates the two concerns. Struts framework is based on MVC2. MVC1 architecture combines business logic with the presentation logic, where as MVC2 seperates the two concerns. Struts framework is based on MVC2.

There can be a few different reasons for doing this.

One is to separate the actual work being done and who is doing it. Have a business logic developer working independently from a creative web developer.

Another reason would be for re-use. Developing reusable business logic components makes sense, instead of embedding that logic where it can't easily be reused in the front end.

Logic = As much as you have. Emotion = Zero. Zip. Nada. Gut Feeling = 20% (Not to be confused with emotion).