Art theft is usually for the purpose of resale or for ransom (sometimes called artnapping). Stolen art is sometimes used by criminals as collateral to secure loans. Only a small percentage of stolen art is recovered—estimates range from 5 to 10%. This means that little is known about the scope and characteristics of art theft.

Many thieves are motivated by the fact that valuable art pieces are worth millions of dollars and weigh only a few kilograms at most. Transport for items such as paintings is also trivial, assuming the thief is willing to inflict some damage to the painting by cutting it off the frame and rolling it up into a tube carrier.^{[citation needed]} Also, while most high-profile museums have extremely tight security, many places with multimillion art collections works have disproportionately poor security measures. That makes them susceptible to thefts that are slightly more complicated than a typical smash-and-grab, but offer a huge potential payoff.

For those with substantial collections, such as the Marquess of Cholmondeley at Houghton Hall, the risk of theft is neither negligible nor negotiable.Jean-Baptiste Oudry's White Duck was stolen from the Cholmondeley collection at Houghton Hall in 1990. The canvas is still missing.

Art is a term that describes a diverse range of human activities and the products of those activities, but is most often understood to refer to painting, film, photography, sculpture, and other visual media. Music, theatre, dance, literature, and interactive media are included in a broader definition of art or the arts. Until the 17th century, art referred to any skill or mastery and was not differentiated from crafts or sciences, but in modern usage the fine arts are distinguished from acquired skills in general.

Many definitions of art have been proposed by philosophers and others who have characterized art in terms of mimesis, expression, communication of emotion, or other values. During the Romantic period, art came to be seen as "a special faculty of the human mind to be classified with religion and science".

The nature of art, and related concepts such as creativity and interpretation, are explored in a branch of philosophy known as aesthetics.

The Encyclopædia Britannica Online defines art as "the use of skill and imagination in the creation of aesthetic objects, environments, or experiences that can be shared with others". By this definition of the word, artistic works have existed for almost as long as humankind: from early pre-historic art to contemporary art; however, some theories restrict the concept to modern Western societies. The first and broadest sense of art is the one that has remained closest to the older Latin meaning, which roughly translates to "skill" or "craft." A few examples where this meaning proves very broad include artifact, artificial, artifice, medical arts, and military arts. However, there are many other colloquial uses of the word, all with some relation to its etymology.

"The Man" is a slang phrase that may refer to the government or to some other authority in a position of power. In addition to this derogatory connotation, it may also serve as a term of respect and praise.

The phrase "the Man is keeping me down" is commonly used to describe oppression. The phrase "stick it to the Man" encourages resistance to authority, and essentially means "fight back" or "resist", either openly or via sabotage.

The earliest recorded use^{[citation needed]} of the term "the Man" in the American sense dates back to a letter written by a young Alexander Hamilton in September 1772, when he was 15. In a letter to his father James Hamilton, published in the Royal Dutch-American Gazette, he described the response of the Dutch governor of St. Croix to a hurricane that raked that island on August 31, 1772. "Our General has issued several very salutary and humane regulations and both in his publick and private measures, has shewn himself the Man." ^{[dubious – discuss]} In the Southern U.S. states, the phrase came to be applied to any man or any group in a position of authority, or to authority in the abstract. From about the 1950s the phrase was also an underworld code word for police, the warden of a prison or other law enforcement or penal authorities.