volatility vix option

Hi everyone, I'm new to the forum, i do option trading.. There are few questions I'm seeking about options but couldn't find anywhere..so i came here to find those questions.. So my questions are this way . Question 1) why does the indiavix show a very big candle at the 9:15, what is the reason...

VIX is the volatility index but 1.wat is that 2. how is it quantified 3. wat is its significance 4. is it a measure of market sentiment at the time or is it a leading or lagging mommentum indicator pls just add anything you know