for variety of the operating systems (mostly desktop ones). Popular UNIX-like ones and Windows are officially supported (and documented), but (minimal) applications can and have been made for Android (with Android NDK) or iOS.

Zig uses LLVM (written in C++) as a backend for optimization. Since version 0.10 the Zig compiler is written in the Zig programming language, i.e., it is a self-hosting compiler.