A lawyer is someone you go to if you have a problem that needs a legal remedy. For example, if you have been arrested or hurt in a road accident.
There are always at least two lawyers.
They are split into two groups, prosecution and defence, and both question witnesses to get at the facts of the case.
The prosecution tries to persuade the magistrates that the defendant is guilty of the charge.
The defence attempts to prove that the defendant is not guilty.