Can this be used to say that you understand or that instructions make sense, or whatever? Or does it just mean clear as in transparent?
It can mean both.
Last time when i answered clear for Klar , I was marked wrong; I also pointed out that the dictionary gave the answer as "clear".
Which is most used, alles klar oder das ist klar. I'm guessing it depends on the situation, but I figured I'd ask to klarify.