If you wish to contest charges, your case will proceed to either a Contested Hearing (Magistrates' Court) or a Trial (County / Supreme Court).
At these hearings the Prosecution must prove to a Magistrate / Judge or Jury that the accused person committed the alleged offences 'beyond a reasonable doubt'.
To do so, the parties will call witnesses, cross-examine (question) the other party's witnesses and provide evidence to the Court which proves why the accused is guilty or not guilty.