AppImage does not install the application in the traditional Linux sense. Instead of putting the application's various files in the distro's appropriate places in the file system, the AppImage file is just the application's compressed image. When it runs, the file is mounted with FUSE. This behavior is consistent with AppImage's predecessors, klik and PortableLinuxApps.
It uses one file per application. Each file is self-contained: it includes all libraries the application depends on that are not already part of the targeted base-system. An AppImage of version 1.0 is an ISO 9660 Rock Ridge file (which can be optionally zisofs compressed) containing a minimal AppDir and a tiny runtime.[4] (Version 2 may use other file system image formats like SquashFS[5][6]). An AppImage application can be added to a live CD by adding only one file to the live CD.
AppImage files are simpler than installing an application. No extraction tools are needed, nor is it necessary to modify the operating system or user environment. Regular users on the common Linux distributions can download it, make it executable, and run it.
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