Generally in a trial both parties will have an opportunity to put their case forward. Cross examination is when Witnesses and various parties are questioned to find out the truth behind the case.
I hope this helps.
Dear kumar, for winning every case in court, cross*xamination must be done cleverly, articulatively which only a few ones have the ability and art to perform. So, attach urself with such a lawyer who is adept in this art of cross examination. Else you wont be able to win the battle of judicial process.