Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. Automatic graph drawing has many important applications in software engineering, database and web design, networking, and in visual interfaces for many other domains.
To install GraphViz, download the correct repository according to the distribution of your choice. The supported distribution is Fedora, RHEL, Ubuntu, Windows, Mac
The easiest way to install and maintain graphviz on RHEL or Centos is to use yum. To set up yum, download the graphviz-rhel.repo file
To install Graphviz,
# yum install graphviz*