# Packages

A Nargo Package is a collection of one of more crates. A Package must include a Nargo.toml file.

A Package must contain either a library or a binary crate.

## Creating a new package

A new package is created using the new command.

$nargo new my-project$ ls my-project
Nargo.toml
src
\$ ls my-project/src
main.nr


## Binary vs Library

Similar to Cargo, Nargo follows the convention that if there is a src/main.nr then the project is a binary. If it contains a src/lib.nr then it is a library.

However, note that dissimilar to Cargo, we cannot have both a binary and library in the same project.