Sorry for n00b question but is there an index like sensex or Nifty that includes the sum total of the entire stock market?

Bhavcopy in new website of NSE

Is 2% discrepancy normal in closing prices in kite vs bhavcopy? eg. 37000PE closing is 296 in bhavcopy, 314 in kite chart @sn2006 @ShubhS9 @
please share me any post link or reason for how these trades happen at else than 3:30pm price.
also for same example, i found there is no CE data for BNF 16-12-21 while there is all other FnO data, how is this possible?

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