Application Programming Interface, translated as application programming interface, is a type of software interface that offers a service to other applications. To connect to such an interface, you need to know a standard that describes how to use such an interface, called an API specification.
Unlike a user interface, which connects a computer to a person, an application programming interface connects computers or pieces of software to each other. It is not intended to be used directly by another person (the end user), but by a computer programmer who integrates it into other software. An API often consists of different parts that act as tools or services available to the programmer.
Thanks to the API, we were able to connect services like Leady, Google Calendar, Mattermost to AutoCRM.