A more thorough explanation:

Definition: Viva voce means to speak or give testimony orally, rather than in writing. It can also refer to a voice vote, where people vote by speaking out loud instead of using a ballot.

Examples:

• During the trial, the witness gave their testimony viva voce, speaking directly to the judge and jury.
• The election was decided by a viva voce vote, with each person stating their choice out loud.

These examples illustrate how viva voce is used to describe oral communication, whether it be giving testimony or casting a vote.