RPM Package Manager (RPM) (originally Red Hat Package Manager, now a recursive acronym) is a free and open-source package management system. The name RPM refers to the .rpm file format and the package manager program itself. RPM was intended primarily for Linux distributions; the file format is the baseline package format of the Linux Standard Base.
The rpm is installed in the first installation of the distro.
If you want to see wich dependencies are required use:
rpm -qp --requires package.rpm