This is the 160th most frequent German word.
klar
Clear.
Here, 'klar' signifies that something is understandable or comprehensible.
Alles ist klar, ich habe keine weiteren Fragen.
Everything is clear, I have no further questions.
In this context, 'klar' describes the physical transparency or purity of the water.
Das Wasser im See ist wirklich klar.
The water in the lake is really clear.
In this sentence, 'klar' is used to inquire about someone's certainty or realization regarding an action.