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Application Binary Interface (ABI), in computer software, is an interface between two binary program modules. Often, one of these modules is a library or operating system facility, and the other is a program that is being run by a user. An ABI defines how data structures or computational routines are accessed in machine code, which is a low-level, hardware-dependent format. In contrast, an API defines this access in source code, which is a relatively high-level, hardware-independent, often human-readable format.

Source: https://en.wikipedia.org/wiki/Application_binary_interface