The volume of E-mini Light Crude Oil Futures is 2.58 K.
Open interest is the number of contracts held by traders in active positions — they're not closed or expired. For E-mini Light Crude Oil Futures this number is 886.00. You can use it to track a prevailing market trend and adjust your own strategy: declining open interest for E-mini Light Crude Oil Futures shows that traders are closing their positions, which means a weakening trend.