A more thorough explanation:

A closed trial is a legal proceeding where only certain people are allowed to attend. This means that the public and media are not allowed to be present during the trial.

For example, a closed trial may be used in cases involving sensitive information, such as national security or cases involving minors. In a closed trial, only the judge, jury, lawyers, and parties involved in the case are allowed to be present.

This type of trial ensures that sensitive information is not disclosed to the public and protects the privacy of those involved in the case.