Lexicon Entry
Mach-O
The executable file format used by macOS, iOS, and other Apple platforms. Supports fat/universal binaries bundling multiple architectures.
Related Knowledge & Cross-References
Guide
Executable File Formats: ELF, PE, and Mach-O Explained
How does the operating system know how to take that file and turn it into a running process? The answer lies in the Executable File Format.