Bob woodward and carl bernstein, two post reporters, reported on the watergate break-in with the of an unknown informant.
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"Watergate" refers to efforts by persons working for President Nixon's reelection campaign to spy on their opponents at Democratic party headquarters, and subsequent efforts to cover up those crimes.

The first break-in attempt by burglars working on Nixon's behalf occurred  in May, 1972, as persons connected to the Nixon reelection campaign broke into the Democratic National Committee office in the Watergate complex of buildings in Washington, DC.  They were planting wire-taps on the Democrats' phone lines, and also stole copies of documents.  When the wire-taps didn't work properly, they broke in again (in June) to try to fix the surveillance devices, but they were caught.

An insider at the FBI who remained anonymous at the time, known only as "Deep Throat," began to give information concerning Watergate to reporters Bob Woodward and Carl Bernstein of the Washington Post.   Persistent investigative reporting by Woodward and Bernstein brought the scandal to light and forced Congressional hearings.   (Note:  Years later it was revealed that Deep Throat was Mark Felt, who at the time was Associate Director of the FBI.)

Nixon's role in Watergate was especially in his efforts and those of members of his staff to cover up what had happened.  Ultimately, the Watergate affair brought down the Nixon presidency.  He resigned in order to avoid impeachment.  And the whole affair made Americans more distrusting of government.