I'd like to propose a moratorium on LMGTFY. While funny five years ago, this is basically a sarcastic way of saying "look it up yourself." I can't speak for the OP, but the one time in my life I've been the recipient of such an answer, I would have rather there had just been no reply. Furthermore, in a good half the cases where I've personally seen it used on others, the first page contained perhaps a definition, but very little useful information beyond the obvious. As if maybe the Googler didn't even look at the results, and just assumed the answer to the painfully obvious query would be prominent. This may be just my own experience vs. representative samples, I understand...
As a positive alternative, I think the OP's question can be easily expanded beyond "what's that?" to "what is considered low-enough?" or "what am I getting myself into that I may not know enough to ask about in advance?" At least here in Arduino land, when someone asks a question like this, there's often a good page or two of replies with thoughtful and though-provoking answers that I may never have pondered myself had I not stumbled upon the post. In other words, a simple question contributed to the common good -- at least for me.
So, just a thought. If this is not a popular opinion, I'm willing to be overruled.