21CTO

Oct 11, 2024 · Fundamentals

Why macOS Sequoia’s UNIX Certification Matters for Developers

Apple’s macOS 15 Sequoia has become the latest officially certified UNIX® system, joining both Apple Silicon and x86‑64 entries, and the article explains the history of UNIX, POSIX standards, the XNU kernel’s BSD roots, and how these foundations shape modern macOS and iOS development.