N It is a set of core tools inside Debian and Ubuntu system. You can use the apt command to install apps, remove apps, keep your system up to date and more. Apt work with dpkg to install and update system. I suggest you use the apt command to save typing at the CLI. apt-get is the first front end tool. apt is a second tool which overcomes some design mistakes of apt-get. Hence you should use apt command. It is going to be default in Ubuntu and Debian LTS version.