Cubism was an early 20th century avant-garde art movement pioneered by Pablo Picasso and Georges Braque that revolutionized European painting. It involved depicting subjects from multiple viewpoints to represent them in greater context rather than a single perspective. There were two major branches - Analytic Cubism focused on deconstructing objects and Synthetic Cubism incorporated collage materials into compositions. Picasso's work progressed through different periods that influenced Cubism including his Blue Period and Rose Period, and he remained a pivotal figure within the movement and in modern art throughout his life.