Part of using a Linux-based operating system is using the package manager of your Linux distribution to download and install new software. On CentOS/RHEL-based distributions for example, the EPEL repositories provide you with almost everything you need. And often when a pre-installed repository is unavailable, you can manually add it and the files will be downloaded securely after verifying it with a key. However, sometimes you have no choice but to download the packages directly over the Internet. One example is the operating systems themselves. If you want to download a new distribution, you???ll have to get it from a website.