It takes up less space, easy to upgrade package and the package manager initially only. Packaged tar.gz source files, users had to compile each want software that runs on GNU / Linux. System users an urgent need to provide a way to manage the software installed on the machine when Debian was born, so it was in a line of software installed on these machines, when Debian was born, so there is a management tool came into being, it was named dpkg. thus the famous "package"
