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Republican presidential nominee Donald Trump and Democratic presidential nominee Hillary Clinton shake hands at the end of their first presidential debate at Hofstra University in Hempstead, New York, Sept. 26, 2016. Reuters

The final presidential debate before the 2016 election will take place on Oct. 19. Like the previous debates, it will run 90 minutes from 9:00 p.m. to 10:30 p.m. EST with no commercial breaks.

Who's moderating? Chris Wallace, the anchor of Fox News Sunday. This will be the first time a Fox News anchor has moderated a national debate.

Where is it? The University of Nevada, Las Vegas' Thomas and Mac Center.

What's the format? The same as the first debate. It'll be divided into six segments approximately 15 minutes each. Each segment will be about a topic selected by the moderator. He'll open each segment with a question and each candidate will have two minutes to respond and an additional chance to respond to one another. The topics will be announced a week before the debate.

Where can I watch it? It will air on many networks, including C-SPAN, ABC, CBS, FOX, NBC, Fox News, CNN, and MSNBC. It'll also live stream online in places like Facebook Live.

What happened at the other debates? There have been three previous debates, two presidential and one vice presidential. The first presidential debate was moderated by Lester Holt at Hofstra University in Hempstead, New York on Sept. 2. The second took place Sunday at Washington University in St. Louis and was moderated by Martha Raddatz and Anderson Cooper. The vice presidential debate took place on Oct. 4 at Longwood University in Virginia and was moderated by Elaine Quijano.

Who picks the moderators? The moderators are chosen by the Commission on Presidential Debates based on their familiarity with the candidates and issues, experience in broadcast news, and understanding of the debate's setup.

Who picks the locations? Various sites bid for the debates and the Commission on Presidential Debates decide on a spot after reviewing proposals, surveying the sites, and consulting with the White House. The Commission has held all but three debates ever on college and university campuses.

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