A government shutdown occurs when the president and Congress fail to come to an agreement on federal funds. .When a shutdown occurs, "nonessential" federal employees will not work until an agreement is made. .The employees are placed on "furlough," but are typically paid retroactively once the shutdown is over. .The FDA, Internal Revenue Department and Dept. of Interior, including the National Park Service, are some of the departments that are affected by a shutdown. .The military and other sectors, such as the TSA and the Postal Service, are considered essential and will remain active. .Government-provided services such as welfare and Social Security benefits continue, but new applications are typically not accepted until the shutdown is over.The longest government shutdown occurred on December 22, 2018, until January 25, 2019 (35 days)