Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Synaptic is a graphical user interface (GUI) for managing software packages on Debian-based distributions. If you are using Debian or Ubuntu you will easily find Synaptic in the System Tools menu or in the Administration menu. Synaptic uses the GTK graphic libraries . So, if you are using GNOME on your debian-based distro you will probably have Synaptic installed as well. Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+.
Now we will see how to add repositories,install,remove and update software packages
Adding repositories Using Synaptic
To Open Synaptic Package manager go to System—>Administration—>Synaptic package manager