Take a look at the picture below. You see a batsman and behind him a wicket keeper, one of his opponents. The batsman is defending his stumps, on top of which are some small bails. The stretch of ground ahead of the batsman is known as the wicket, and there is another set of stumps at the opposite end, where the batsman's partner is standing, waiting for their joint action. There is at the end opposite the batsman a bowler, whose job is to overarm bowl [not throw] the very hard leather ball at the batsman's stumps. If he hits the stumps and dislodges the bails he has got the batsman out, but if the batsman hits the ball, he/she, for there is women's cricket, can make a run. Both batsmen run at the same time The batsman has scored one run, but now his partner is standing to defend the stumps. However, you can score more than one run at a time.
Note the body armour, for the hard leather ball is dangerous. When I was at school I saw a lad in my year who had just been hit on the head by one, and the lump was huge! Some bowlers try to intimidate the batsman by bowling at his body, and that is not a pleasant experience.
The bowler has to bowl the ball overarm, but not throw it. If he throws it, it counts as a no ball. When bowling, stepping over the white line of his crease means a no ball. Look at the second picture below and you will see that the bowler has a white line just before her feet. This is the crease. Another bowling misdemeanour is bowling a wide, which is when the ball is sent too far to the batsman's side to be reached. It is penalized by an extra run.
The bowlers bowl their balls in units of six, called overs. After an over a team can swap their bowler. This reminds me of the story of my very non-sporty mother. Not long wed, she was taken to a cricket match by my father, but she did not understand the cricket jargon, so when the knowledgeable lady next to her said "Over" Mum got up to go and said "That was quick!" But mother far preferred dancing!
There are only two batsmen on the field at a time, but all the opposition are on. One is the bowler, the other ten are fielders, whose job is to catch the ball before it hits the ground, and if they do this the batsman is out. The wicket keeper that you see in the picture is specialist fielder. A side is out when ten of its batsmen are out, whereupon the next side takes its turn. The winner is the one with the most runs when the game is over.