Manjaro installation images are available for download as ISO files. An ISO file is itself a literal copy of a disc image, although not in the same sense as a copy and paste duplication, rather it is a copy of the raw machine code that makes up the files and folders of that disc. This is why just copying an ISO file to a disc (or USB flashdrive) to begin installing it won't work; you'll need to use a disc burning application to translate that raw data into the files and folders. Instructions to do so for both Linux and Windows operating systems are provided below.
There are currently three Official Manjaro Editions: Gnome, KDE and Xfce. You can view a brief introduction at the Manjaro Official Webpage
On the OSDN download server, each Manjaro Edition has its own particular folder, which will contain a folder for each new ISO release. Each folder will also contain a torrent file for the ISO image, a list of the included packages, the build log file and the relevant checksum files, which can be used to check the integrity of your downloaded ISO file, to ensure that it has not been corrupted during download. A link to the guide on doing this has been provided below.
Stable Releases of Manjaro are intended to be used by the general public. As such, they will be the appropriate choice for the majority of users.
Test Builds of Manjaro are intended to be used by developers and testers, in order to identify any bugs or issues to be addressed as their development continues towards the next stable release. These are not suitable nor intended for use by the general public as a main operating system; however, should you wish to try out a test build (preferably in a virtual machine) each current release have a look at the Forum Announcements.
There are also several Community releases for the most famous, or hardly known Display Environments, like Cinnamon, MATE, i3, Awesome, Deepin, Budgie, LxQt and Openbox.
You may find them in the Manjaro website: