Art criticism is the analysis and evaluation of works of art. It involves examining the formal elements of the work, such as composition, color, and texture, as well as the work's meaning and significance.

The three main types of art criticism are formalism, iconography, and semiology. Formalism focuses on the formal elements of the work, such as composition, color, and texture. Iconography focuses on the meaning of the symbols and images in the work. Semiology focuses on the relationship between the work and its cultural context.

Art criticism is subjective because it involves the critic's personal opinion of the work. Art history is objective because it focuses on the facts about the work, such as its date of creation, its artist, and its cultural context.

Art critics consider a variety of factors when evaluating a work of art, including its originality, technical skill, emotional impact, and historical significance.

Art criticism plays a vital role in the art world by helping artists improve their work, educating the public about art, promoting the sale of art, and creating a dialogue about art.

John Ruskin, Clement Greenberg, Harold Rosenberg, and Susan Sontag are all considered to be among the most famous and influential art critics of all time.

Formalism, iconography, semiology, and postmodernism are all considered to be important art criticism theories.

Art criticism has changed over time in a number of ways, including becoming more subjective, more objective, more interdisciplinary, and more global.

Art criticism today faces a number of challenges, including the increasing commercialization of art, the rise of new media art, the globalization of art, and the changing role of the art critic.

The future of art criticism is likely to see it become more interdisciplinary, more global, more digital, and more accessible.