The Fedora project has announced that the “yum” package manager will be replaced by “Dandified Yum” (dnf). Work started on dnf package manager back in January 2012 when it was forked from yum. It was made available for experimental use in Fedora 18, and work is underway to make it the default package manager for Fedora 22.
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Everything You Need to Know About the DNF Package Manager (Make Tech Easier)