Another chapter in the story of Ireland's longest-running television programme is coming to a close, as Ryan Tubridy wraps up before handing over the presenter's chair to Patrick Kielty. Mark O'Brien, head of DCU's School of Communications and associate professor in journalism history, and Kirsty Blake Knox, writer with the Irish Independent, delve into The Late Late Show's history, examine its enduring popularity, and ask what its new presenter must do to keep it going strong.The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/