Yum（Yellow dog Updater, Modified）由Duke University团队，修改Yellow Dog Linux的Yellow Dog Updater开发而成，是一个基于RPM包管理的字符前端软件包管理器。能够从指定的服务器自动下载RPM包并且安装，可以处理依赖性关系，并且一次安装所有依赖的软件包，无须繁琐地一次次下载、安装。被Yellow Dog Linux本身，以及Fedora、Red Hat Enterprise Linux采用。

The Yellowdog Updater, Modified (yum) is an open-source command-line package-management utility for Linux operating systems using the RPM Package Manager. Though yum has a command-line interface, several other tools provide graphical user interfaces to yum functionality.