Well, cross-examination is like when you play a game of question and answer with a friend. However, there is little difference. In cross-examination, it is more like a real game, and someone usually takes it very seriously. The game's name is the law case, and everyone has a role to play in it either as a lawyer or a witness.
When lawyers or attorneys ask someone questions, and they answer them, it is called examination. But, cross-examination is like asking a witness who has given answers to the questions some more questions, and in a different way, to check if the answers are true or not.
For instance, if a lawyer asks a witness if they saw a car accident happen, they might reply with a "yes." But during cross-examination, the lawyer may ask how far away were they standing when it happened, what color was the car in the accident, and what direction the car was driving.
This makes it easier for the lawyer to know if the witness is telling the truth, or they are unsure because their answers might start to sound different, or they might say something that doesn't add up. The questions keep coming until the cross-examiner is sure that the witness is telling the truth, or they catch the witness lying.
Thus, cross-examination is a process where lawyers ask extra questions to check if the witness's answers are accurate before finishing the game.