Why Open Interest Is Importent in Trading 

Open Interest analysis can provide market trend 

Open interest charts indicate the direction of future market trend

Open Interest analysis can provide   Importent Support & Resistance

Open Interest  is  market indicator but it should be combined with other technical indicators to Generate Profitable trades

Option Writers are generally market players with deeper pockets compared to option buyers

High Put-Call ratio  (PCR)  means  bullish sentiment

Low Put-Call ratio (PCR) means bearish sentiment 

For Nifty and Banknifty Option Trading Strategy