Witness

A witness is someone who knows about a crime or dramatic event and can certify to its happening. A witness who has seen the event at first-hand is known as an eye-witness. Witnesses are often called before a court of law to testify in trials.

There have been a number of films and television dramas revolving around the idea of the witness, generally with the word in their title - Witness for the Prosecution, Witness (TV series)[?], Silent Witness, Mute Witness[?], and Witness (1985 movie).

A certain number of witnesses are legally required to be present at weddings and certain other official events to sign the paperwork.