'What is'
'What is' does not exist in words, but we can use words to point to it.
'What is' is what exists, now. It is what is experienced and known directly.
There may be several ways we might refer to 'what is'. For example, we might say 'I am angry' or 'there is anger' or 'there is energy in my chest'. Or, we may experience 'what is' directly, which means not thinking about the experience at all, but 'being with it'.
If we are judging ourselves, or blaming someone else, for what is felt, then the focus of our attention is not on 'what is', but on a story that is emotionally charged, where there is a good or bad guy. 'You did this to me' or 'It's all my fault' is not 'what is' - these are both stories.
Getting ever further from stories and ever closer to 'what is' is an unburdening and enlightening experience. Finding the 'is' beneath the story may take practice, but the evermore directly we experience reality and the ever less vague concepts we can use to describe what we directly experience, the evermore clearly we can relay our experience to others, if that is something we wish to be able to do.