1. 应用程序接口(API)：
API代表应用程序编程接口，它是各种程序用于在应用程序和网站等技术产品之间进行通信的通信协议和子程序的集合。
2.图形用户界面(GUI)：
GUI 代表图形用户界面。它是一个软件平台，允许用户通过视觉指示器表示与电子设备进行交互。
API 和 GUI 之间的区别是：
| S.No. | API | GUI |
|---|---|---|
| 1. | An API permits the communication between two programs. | GUI allows interaction between a human and a computer program. |
| 2. | APIs require high technical skills to leverage. | GUI doesn’t require too much technical know-how or the need to leverage. |
| 3. | API requires back-end storage that is backed by a logical architecture, a library of scripts, and regular management. | GUI requires few resources. |
| 4. | APIs tests are fast in action. | Graphical User Interface tests tend to take longer. |
| 5. | API is cheaper. | GUI is expensive. |
| 6. | API allows the exchange of data through XML or JSON. | GUI doesn’t allows the exchange of data through XML or JSON. |
| 7. | API allows more flexibility when it comes to automation and innovation. | GUI is less flexible when it comes to automation and innovation. |
| 8. | API allows your program to interact with servers. | GUI allows users to interact with your program. |
| 9. | An API is an interface to a library that need use GUI. | Implementing a GUI can involve an API. |
| 10. | Types – Web API, Internal API, Partner API, Open API, etc. | GUI includes Microsoft Windows, macOS, Ubuntu Unity, etc. |