Tags give the ability to mark specific points in history as being important
ruby-sprockets-rails Debian release 3.5.2-1~bpo12+1
Tagging debian version 2.3.2+git-1.
Tagging upstream version 2.3.2+git.
ruby-sprockets-rails Debian release 2.3.2-1~exp1
ruby-sprockets-rails Debian release 2.0.1-2