Runs

The primary concern of the batsman on strike (i.e., the "striker") is to prevent the ball hitting the wicket and secondarily to score runs by hitting the ball with his bat so that he and his partner have time to run from one end of the pitch to the other before the fielding side can return the ball. To register a run, both runners must touch the ground behind the crease with either their bats or their bodies (the batsmen carry their bats as they run). Each completed run increments the score.
More than one run can be scored from a single hit; but, while hits worth one to three runs are common, the size of the field is such that it is usually difficult to run four or more. To compensate for this, hits that reach the boundary of the field are automatically awarded four runs if the ball touches the ground en route to the boundary or six runs if the ball clears the boundary on the full. The batsmen do not need to run if the ball reaches or crosses the boundary.

Sachin Tendulkar is a legendary Indian batsman who holds multiple records including highest number of runs and centuries scored in both Test and ODI forms of Cricket.
Hits for five are unusual and generally rely on the help of "overthrows" by a fielder returning the ball. If an odd number of runs is scored by the striker, the two batsmen have changed ends, and the one who was non-striker is now the striker. Only the striker can score individual runs, but all runs are added to the team's total.
The decision to attempt a run is ideally made by the batsman who has the better view of the ball's progress, and this is communicated by calling: "yes", "no" and "wait" are often heard.
Running is a calculated risk because if a fielder breaks the wicket with the ball while the nearest batsman is out of his ground (i.e., he does not have part of his body or bat in contact with the ground behind the popping crease), the batsman is run out.
A team's score is reported in terms of the number of runs scored and the number of batsmen that have been dismissed. For example, if five batsmen are out and the team has scored 224 runs, they are said to have scored 224 for the loss of 5 wickets (commonly shortened to "224 for five" and written 224/5 or, in Australia, "five for 224" and 5/224

Additional runs can be gained by the batting team as extras (called "sundries" in Australia) due to errors made by the fielding side. This is achieved in four ways:
No ball – a penalty of one extra that is conceded by the bowler if he breaks the rules of bowling either by (a) using an inappropriate arm action; (b) overstepping the popping crease; (c) having a foot outside the return crease. In addition, the bowler has to re-bowl the ball. In limited overs matches, a no ball is called if the bowling team's field setting fails to comply with the restrictions. In shorter formats of the game (20–20, ODI) the free hit rule has been introduced. The ball following a front foot no-ball will be a free-hit for the batsman, whereby he is safe from losing his wicket except for being run-out.
Wide – a penalty of one extra that is conceded by the bowler if he bowls so that the ball is out of the batsman's reach; as with a no ball, a wide must be re-bowled
Bye – extra(s) awarded if the batsman misses the ball and it goes past the wicketkeeper to give the batsmen time to run in the conventional way (note that one mark of a good wicketkeeper is one who restricts the tally of byes to a minimum)
Leg bye – extra(s) awarded if the ball hits the batsman's body, but not his bat, while attempting a legitimate shot, and it goes away from the fielders to give the batsmen time to run in the conventional way.
When the bowler has bowled a no ball or a wide, his team incurs an additional penalty because that ball (i.e., delivery) has to be bowled again and hence the batting side has the opportunity to score more runs from this extra ball. The batsmen have to run (i.e., unless the ball goes to the boundary for four) to claim byes and leg byes but these only count towards the team total, not to the striker's individual total for which runs must be scored off the bat