Composer allows you to build packages of software, applications, preference files, or documents. A package is a self-contained group of files that can be deployed to remote computers or as part of the imaging process.

The first step to building a package is creating a package source. Depending on the files you want to package, Composer allows you to monitor the installation of your software or use files that already exist on the drive to create the package source.

After you create a package source, you can build a PKG or a DMG from the package source.

Composer also allows you to build a DMG of an operating system.