What is a snap?
is a squashFS filesystem containing your app code and a
snap.yamlfile containing specific metadata. It has a read-only file-system and, once installed, a writable area.
is self-contained. It bundles most of the libraries and runtimes it needs and can be updated and reverted without affecting the rest of the system.
is confined from the OS and other apps through security mechanisms, but can exchange content and functions with other snaps according to fine-grained policies controlled by the user and the OS defaults.