What aspect of applications does "Business Logic" primarily control?

Business logic is essential to the functioning of an application as it dictates how data is processed and how workflows are executed within the system. It encompasses the rules, decisions, and calculations that determine the behavior of an application, ensuring that actions taken by users produce the expected results based on the data inputted and the context in which they operate.

In particular, business logic governs the sequences of operations that manipulate data and the conditions under which different operations occur. It includes the implementation of processes that fulfill business requirements, such as validating user input, applying business rules, and managing data transitions between different states of an application.

While other choices relate to important aspects of application development—such as user interface presentation, API connectivity, and mobile responsiveness—they do not encapsulate the core function of business logic, which is primarily centered on data processing and workflow management. Thus, the emphasis on this choice is foundational to understanding how applications perform and respond to various inputs in a business-driven context.