Delta RPMs disabled because applydeltarpm not installed

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I getting the following warning on both CentOS 7 and RHEL (Red Hat) 7 when I run :
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
What is delta RPM (DRPM) and how does it differ from RPM? How do I fix this issue on a CentOS or RHEL 7 server/desktop?

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