1 Over = 6 balls
They are playing One Day International format
ODI = 50 Overs = 300 balls
you get 10 outs (wickets) and you have to make it last for the 300 balls
if you get all the 10 outs before the 300 balls that team's inning is finished
if a team has "wickets in hand" meaning they only have a few outs and the match is coming to an end the batting team can "risk" more and go for bigger shots
bigger shots = roll the ball out the field 4 runs, batted out the field in the air 6 runs