if you are in kde4 konsole uses bash
most distros will use bash only but there is alternatives
cli is console line interface and calls the app you want, in our case is bash
there is other options but i always used bash when i need it, and honestly i don't need it much, maybe to do something each week or two, most of what you do in console can be done graphically, especially on pclinux
console is on decline you know? not for being not useful, just you have to learn some things and people prefers to use gui(graphical user interface) environments