Final answer:
Various art movements and styles emerging in the early 20th century, including Cubism, Dada, Surrealism, and others, are known collectively as Modernism, which was marked by innovation and a break from the past.
Step-by-step explanation:
The variety of movements and styles that emerged in art and design in the early 20th century in response to historical factors and industrial processes are collectively known as Modernism. Modernism in art was characterized by a spirit of experimentation and rejection of established aesthetic norms, favoring abstraction and a range of different styles from Cubism and Surrealism to Expressionism and Futurism. Influential artists like Pablo Picasso, Marcel Duchamp, and Henri Matisse were heavily involved in these radical movements, producing works that frequently challenged traditional ideas of representation, emphasized the importance of individual perspective, and encapsulated the zeitgeist of the tumultuous times during and after the World Wars.