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How did the end of the Younger Dryas mark the beginning of the Holocene?

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A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Holocene Epoch The stratigraphic chart of geologic time.

The end of the Younger Dryas approximately 11,600 to 11,700 years ago marked the beginning of the Holocene Epoch through a period of abrupt and significant climatic warming.1

Following the Younger Dryas—a cool interval that had returned parts of the Northern Hemisphere to ice age conditions—the Earth experienced a rapid transition to a warmer climate. Evidence from Greenland ice cores indicates that local temperatures rose by as much as 10 °C (18 °F) within just a few decades. This warming event effectively ended the late Pleistocene Epoch and established the modern climatic conditions that define the Holocene.1

This transition is formally recognized in geochronology by the start of the Greenlandian stage, which coincides with the lower boundary of the Holocene. While various markers have been proposed for this boundary, the rapid climatic shift following the Younger Dryas serves as the primary indicator for the onset of this current epoch.21