A witness is someone who has first-hand knowledge about a crime or dramatic event through their senses (e.g. seeing or hearing) 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. A witness who specializes in an area of study relevant to the crime is called an expert witness. Scientists and doctors are often called to give expert witness testimony.
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 (television 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.
