YUM stands for Yellowpage Updater Modifier is a Package Manager tool for rpm package supportable Linux distros/Operating Systems ex: RHEL 5/6/7 and so on. It is used to install, uninstall, update, list available packages, list installed packages and search the rpm packages from the database. The main purpose of yum is to install rpm packages easily with all required dependencies and convenient way of package manager for administrators. YUM was first introduced on RHEL 5 then available on all later versions. When we try to install some package from client side using yum command it’s downloads the requested package and its dependencies from YUM Repository Package Manager Server and makes us available to install it.