What is an ABI

This article provides a clear, beginner-friendly explanation of the Application Binary Interface (ABI). It starts by defining the concept of an interface in computing, contrasting user interfaces, APIs, and ABIs. The author explains that while APIs allow interaction at the source code level, ABIs operate at the binary level, enabling compiled code to communicate during runtime. Using Swift and iOS as examples, the article describes how code is compiled into binary and how ABIs facilitate interactions between compiled components. The content is educational, focusing on foundational programming concepts without promotional material.