An Application Interface is a set of rules and protocols that allows different software applications to communicate with each other. It defines how requests and responses are structured, enabling developers to integrate various systems and services seamlessly. This can include anything from web applications to mobile apps, facilitating data exchange and functionality. There are different types of application interfaces, such as Application Programming Interfaces (APIs) and User Interfaces (UIs). While APIs allow software to interact programmatically, UIs provide a way for users to interact with applications visually. Both types are essential for creating efficient and user-friendly software experiences.