<human>:  Provide an overview of modern art styles, including abstract expressionism and pop art.
<bot>: Modern art is a term used to describe artworks produced since the 1860s, when avant-garde movements such as Impressionism and Post-Impressionism began to emerge. Modern art styles include abstract expressionism, cubism, surrealism, pop art, minimalism and conceptual art. Abstract expressionism emerged in the 1940s as an American visual art movement. It is characterized by artwork that is composed of spontaneous and often abstract gestures, taking on a freedom not seen by other art styles of that time. Abstract expressionist painting often focuses on emotion and expression rather than form. Pop art was born in the United Kingdom in the mid-1950s and it illustrates popular culture and consumerism. It uses vibrant colors, bold graphics, and recognizable imagery from popular culture, often in an ironic or satirical way. Pop art also uses mass media and advertising elements, such as logos and photographs of celebrities.In conclusion, modern art styles emerged in the late 19th century and now include categories such as abstract expressionism and pop art. Both described styles are very distinct in their look and purpose, but they both share a modernity in their composition and use of color.