Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Network managers are utilities that allow users to control the network in their operating systems. This includes configuring various network devices, setting up IP addresses, dialing connections to ISPs, and other settings. Every operating system has a network manager. Some are GUI, some are command line, some are friendly, others are not. Whatever their look and feel, they do one thing - allows us to change important network settings without directly accessing different configuration files that define the network.
Linux distros have a broad range of managers. In KDE, the default utility is called KNetworkManager. In Gnome, it is - aptly called - Gnome Network Manager.
Some Linux users do not like either of these two. They find them cumbersome and counter-intuitive, especially the Gnome Network Manager.