Jackson Pollock was an American abstract expressionist painter known for his unique style of drip painting. He is considered one of the most influential artists of the 20th century. Pollock's paintings were characterized by the use of unconventional techniques, such as pouring and dripping paint onto the canvas. His energetic and spontaneous approach to art challenged traditional notions of composition and representation. Pollock's most famous works, such as No. 5, 1948, are characterized by their large scale, dynamic movement, and intricate layers of paint. His innovative techniques and emphasis on the process of creation continue to inspire artists and provoke discussions about the nature of art.