: By default, Rust builds executable files or internal Rust libraries ( .rlib ). To create rust_new.dll , the developer must explicitly tell the Rust package manager, Cargo , to use the cdylib crate type. This ensures the output is a standard C-compatible dynamic library that other languages can understand.

In the world of software, a DLL is a library that contains code and data that can be used by more than one program at the same time. Historically, developers used C or C++ to write these because they needed high performance and direct memory access.

: Rust "mangles" function names to keep them unique. For an external program to find a function inside rust_new.dll , the developer must use the #[no_mangle] attribute. This acts as a bridge, keeping the function name exactly as written so the host application can call it.