Yum

RPM
RPM (orginally: Red Hat Package Manager) is a low level package manager distributed by Red Hat and Fedora.

RPM is comparable (and precedes) dpkg on Debian distributions.

Example commands
List installed packages rpm -qa

List installed files rpm -ql apache

Get info about a package: rpm -qi zsh

Yum
Yum is a high-level package manager distributed by Fedora Linux and CentOS.

Example Commands
Search for a package: yum search apache

Get info about a package: yum info zsh

Install a package: yum install zsh

Remove a package yum remove zsh

Install updates: yum update zsh yum update