Build a Rust shared library by setting crate-type to cdylib in Cargo.toml and running cargo build --release.
Create a library crate, add the cdylib crate type to Cargo.toml, and run cargo build --release to generate the shared library file.
[lib]
crate-type = ["cdylib"]
cargo build --release
The resulting file (e.g., libmylib.so, libmylib.dylib, or mylib.dll) will be in the target/release directory.
Building a shared library in Rust compiles your code into a reusable file that other programs can load and run. Think of it like baking a cake that you can serve to many different guests, rather than baking a new one for each person. You use this when you need to share functionality between different programming languages or applications.