The Associated Press projected that Hillary Clinton was the presumptive nominee of the Democratic Party on Monday — a day earlier than she was expected to clinch — because it determined that she won the support of the majority of delegates: 2,383.

How Did She Get There?

Mrs. Clinton went over the top with the support of around 20 additional superdelegates, the officials who represent about 15 percent of the delegates to the Democratic convention. These delegates did not previously commit to Mrs. Clinton, but pledged their support to her in interviews with The A.P.

Over all, the 2,383 delegates who support Mrs. Clinton include 1,812 pledged delegates — those bound based on the results of the primaries and caucuses — and 571 superdelegates, according to the A.P. count. The A.P. provides delegate counts and election results to many news organizations, including The New York Times.

Bernie Sanders trails by more than 800 delegates. He holds 1,569 delegates, with 1,521 pledged delegates and 48 superdelegates.