Quick guide, howto remove and disable YUM repo (repository). Yum command itself does not contain any way to remove the repository. YUM repo files is located in /etc/yum.repos.d/ directory.
YUM ( Yellowdog Updater, Modified ) is a command-line package management utility for RPM-based Linux systems, It has been released under the GNU General Public License. Yum is useful for RPMs which have dependencies, Yum searches for all dependencies of any RPM in all available repositories. Below list contains top 4 yum repositories (EPEL, REMI, ATrpms, Webtatic) for RHEL based systems with installation links, which we need to keep our system up to date with latest packages. These repositories having most of the RPMs required for servers.