"En plein air" is commonly used to describe the practice of painting outdoors. It is a French term that literally translates to "in the open air". However, there are several other synonyms that can be used to describe this artistic technique. These include "plein air painting", "landscape painting", "outdoor painting", "natural painting" and "scenic painting". Regardless of the term used, the basic idea remains the same: to create a painting while immersed in the beauty and tranquility of nature. This method has been favored by many famous artists throughout history, including Claude Monet, Vincent van Gogh, and John Constable.