Accused is a name for anyone who is believed to have committed a crime, and who has either been arrested or indicted. The accused are also known as defendants. The accused must defend themselves in a trial if they wish to dispute the charges made against them. If they win, the charges are dropped. If they lose, then they can face prison or other punishments.
Accused basically just means that the person is believed to have committed a crime, and that they must present a defense in a court of law. The crimes could vary from trespassing all the way to murder one. Regardless of the crime, an accused person is an accused person. Defense attorneys help the accused argue their cases as they stand trial. At the end of the trial, the jury decides if the accused person will be convicted or not.