Fedora 20 x86_64 edition is not a Live Media, but it is bootable. When you boot from this media, you will be running the installation program. The DVD requires less memory (RAM) on your computer and contains more software. This media may be useful if the machine on which you install Fedora is not connected to the Internet.
About Fedora
The Fedora Project is an openly-developed project designed by Red Hat, open for general participation, led by a meritocracy, following a set of project objectives. The goal of The Fedora Project is to work with the Linux community to build a complete, general purpose operating system exclusively from open source software. Development will be done in a public forum. The project will produce time-based releases of Fedora about 2-3 times a year, with a public release schedule. The Red Hat engineering team will continue to participate in building Fedora and will invite and encourage more outside participation than in past releases. By using this more open process, we hope to provide an operating system more in line with the ideals of free software and more appealing to the open source community.