I'm going to sound like a total newb... but what exactly does a GUI do? I looked it up on wikipedia and it tells me:
In computer science, a graphical user interface or GUI, pronounced /ˈɡuːi/ ("gooey")[1] is a type of interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation, as opposed to text-based interfaces, typed command labels or text navigation. GUIs were introduced in reaction to the perceived steep learning curve of command-line interfaces (CLIs),[2][3][4] which require commands to be typed on the keyboard.
So if it is just using icons, what purpose does this have with monero; or any other crypto currency for that matter? It seems like a really important factor to a coins success... and even though I've always looked over it for a short while when reading posts, now I would like to fully understand what it is, what it does, and why is it important for monero to have one.
At the moment, to use monero you need to use command line. For many, especially windows and mac users, this is not very intuitive and "easy" thing to do. Its easier to use graphical interface to operate your wallet
The monero designed wallet is here:
https://imgur.com/a/ERheR Its not yet ready.
Its important, because having graphical interface for monero software, would increase its adaptation and use. At the moment, many users avoid it due to being afraid of working with "difficult" command line.