Doubt in FII/DII data

What does ‘Pro’ mean in ‘Participant wise Open Interest (no. of contracts) in Equity Derivatives’ report on NSE website?

I have seen many Youtube videos where people keep a track only of FII and Pro data but ignore DII data. Why is it so? Why do they ignore DII data? Is DII data not as important as FII data and Pro data?

Pro refers to proprietary trading firms including brokerage houses having prop trading desks.

If you check the data, you will notice that trading by DII in equity derivatives is very very low compared to those done by FII and prop, hence DII data is ignored when it comes to derivatives.