# Package [!INCLUDE [stride-studio-note](../../includes/under-construction-note.md)] Stride uses a package system, wherein each game is contained in a package; a game can also use content from other packages. Thus, sharing resources across multiple games becomes possible. A package is a container for: * Game assets * Code libraries * Dependencies A dependency is a reference from one package to another package, which allows another package to use the contents from this package. When a package is a game, it also contains code executables (one per platform) along with game assets, code libraries, and dependencies. Packages are saved on your hard-disk with the ```.sdpkg``` extension.