The accused person who pleads guilty (admits the guilt) is not yet convicted of the offence until he is formally convicted by the Court.
On a plea of guilty, the brief facts of the case on which the accused is to be convicted will be read in open court. If the accused agrees with the brief facts, then the Court will formally convict him (unless the Court is not satisfied that the agreed brief facts show the commission of the offence). Where the accused does not agree with the prosecution's brief facts (or part of them), the Court will hear evidence from the prosecution and the accused to decide the facts. Such a hearing is called a “Newton Hearing”. After the Court has made a decision on the facts, it will formally convict the accused (unless the Court is not satisfied that the decided facts show the commission of the offence).