How did Jackson Pollock’s drip paintings help shape Abstract Expressionism?

Jackson Pollock’s drip paintings were instrumental in defining Abstract Expressionism, specifically by pioneering the approach known as Action painting.12

Beginning in 1947, Pollock’s radical technique of dripping and splashing commercial enamel paint onto canvases laid on the floor broke away from traditional easel painting. This method emphasized the physical act of creation, where the artist’s spontaneous, instinctual movements—using sticks, knives, and other implements—became as significant as the finished work itself.314

By abandoning conventional composition in favor of complex, tangled skeins of paint, Pollock’s work embodied the movement's core values: the exploitation of paint’s physical character, the expression of the creative unconscious, and the use of large-scale, unified fields of color. His drip paintings opened the way for the bolder, gestural techniques that characterized the Action painting style, which became a dominant force in American art during the 1950s.21