An Application Binary Interface (ABI) specifies the details of how to programmatically interact with a smart contract.

ABI defines a set of rules and conventions for how different programs should interact with each other, including details such as the data types and calling conventions that they should use. This allows different programs to be developed independently and then integrated into a larger system without the need for extensive custom coding.

ABIs are typically used in the context of operating systems and programming languages, where they provide a way for different programs written in different languages to interoperate.