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I often see the phrases 'business logic' and 'application logic' in terms of web development (I assume it also applies to programming in general rather than just web development).
This is quite new to me so I don't really know what it means, could anyone please explain me what is exactly meant by this? Is it just a 'buzz word' used by programmers? Or?
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Business logic focuses on the information itself, while application logic defines how it happens. For example, your application logic might define what programming language to use when building software, while the business logic outlines the functions expected from the final product.
The very definition of the terms "front end" and "back end" comes from the separation of business logic (back end) from the user interface (front end). So yes, business logic should be in the back-end, whether that is a remote service or simply a different layer in the same application.
It refers to the routines that perform the data entry, update, query and report processing, and more specifically to the processing that takes place behind the scenes rather than the presentation logic required to display the data on the screen (GUI processing).
Business logic is the programming that manages communication between an end user interface and a database. The main components of business logic are business rules and workflows.
Say you write a system which solves a business need for a customer.
The sum of all your code is the application logic, or system architecture - basically the entirety of the system you're building.
The business logic is the code subset which models and drives actual business processes. "What happens when an order for Product X is placed? How is the cost of Product Y calculated?" Ie. the bits of code where you probably need some input from the customer/domain expert/project stakeholder.
Ideally, the business logic is separated into its own tier or layer (see the Wikipedia article on N-tier architecture). The rest of the code can often simply be thought of as infrastructure to help that business logic execute (database wrapper, helper functions, service facades, external integration, GUI, etc).
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