Travelers in Manhattan's central business district — and even those far beyond it — have gotten back tens of thousands of hours thanks to fewer traffic jams.
TL;DR: in this case, it’s when drivers are made to pay a toll to drive into Manhattan south of 61th Street in order to cut down on traffic congestion and pollution, as well as raise revenue to fund more transit.
What is congestion pricing?
https://en.wikipedia.org/wiki/Congestion_pricing
https://en.wikipedia.org/wiki/Congestion_pricing_in_New_York_City
TL;DR: in this case, it’s when drivers are made to pay a toll to drive into Manhattan south of 61th Street in order to cut down on traffic congestion and pollution, as well as raise revenue to fund more transit.