EPEL Repository contains many packages and software which is not included in Fedora/CentOS official repository. For Fedora and CentOS users, adding EPEL Repository is a wise thing. This quick tutorial will show you how to install or add EPEL Repository on CentOS 7 system. EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux. As part of the Fedora packaging community, EPEL packages are 100% free/libre open source software (FLOSS).
Steps to install EPEL Repository on CentOS 7 and derivatives
su -c ‘rpm -Uvh http://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm’
Now you can install many packages from EPEL repository.