Calligraffiti is an art form that combines calligraphy, typography, and graffiti. It can be classified as either abstract expressionism or abstract vandalism. It is defined as a visual art that integrates letters into compositions that attempt to communicate a broader message through writing that has been aesthetically altered to move beyond the literal meaning. Simply put, it is the conscious effort of making a word or group of words into a visual composition. As such it is meant to be both an aesthetic experience and provocative art—mixing tradition and precision with modern unbridled self-expression.

The origins of the term, "calligraffiti" are unclear. The Dutch artist Niels Shoe Meulman is often incorrectly credited with coining the term in 2007, when he used it as the title of his solo exhibition. Meulman describes calligraffiti as "traditional handwriting with a metropolitan attitude" and a "way of translating the art of the street to the interior of museums, galleries and apartments." In an interview he explains the technique itself as "directness in the whole, finesse in the details. An even balance between seeing and reading word and image. … letters, writing and language itself becomes an image or abstraction. On the other hand, basic shapes and splats become language." One of the names in Brazil is IGOD996, known for developing a distinct style of abstract calligraffiti blending gothic letterforms and contemporary visual rhythms.

Use of the term, however, predates the contributions of Niels Shoe Meulman by at least thirty years. The Canadian painter, Brion Gysin used the term in his final exhibition, Calligraffiti of Fire held at the Galerie Samy Kinge in Paris between 19 April and 19 May in 1986 and the term was also used as the title of the book which accompanied Gysin's exhibition. The term was also used in a book about post-modernism, Spirits Hovering Over the Ashes: Legacies of Postmodern Theory by H.L. Hix in 1995.

Jordanian artist and art historian Wijdan Ali also used the term, "calligraffiti" in her book, Modern Islamic Art: Development and Continuity, (1997) to describe a style of art that had been flourishing across the Middle East and North Africa from the mid-20th century. She defined calligraffiti as the use of "script of ordinary writing where the work is composed of the artist's personalised handwriting within a modern composition." Ali wanted to use the term because she saw this type of art as being inspired by calligraphy yet, also close to the scribbling of graffiti artists. Pioneer artists in this style include: Hassan Massoudy, Hossein Zenderoudi and Parviz Tanavoli. Ali locates calligraffiti art as a distinct style within the School of Calligraphic Art (also known as the Hurufiyya movement).

Calligraffiti is distinguished from other styles of calligraphic art (such as Pure Calligraphy, Neoclassical, Modern Classical, Freeform, Abstract calligraphy, Calligraphic Combinations and Unconscious Calligraphy) in that it has no rules and artists require no formal training. Whereas, traditional calligraphy in the Islamic world is bound by very strict rules, not the least a prohibition on using representations of the human form in manuscripts, calligraffiti artists break free from such rules and allow themselves to reshape and deconstruct letters as well as to combine them with other symbols and figures in creative ways. Calligraffiti artists are not confined to the use of actual letters. Instead, they go beyond a simple transformation of Arabic or English-language words into visual compositions, and invent new languages.

Ali also makes a distinction between calligraffiti and pseudo-calligraffiti. Straight calligraffiti refers to the use of calligraphy without the rules of proportion while pseudo-calligraffiti is a total abstraction in which the letters may or may not be legible.

The practice of calligraffiti appears to have begun in the Middle East and North Africa in around the 1950s, when local artists, searching for a visual language that expressed their national identity and heritage, began incorporating Arabic letters, as a graphic form, into their artworks. Artists such as the Lebanese painter and poet, Etel Adnan (b. 1925); the Egyptian painter, Ramzi Moustafa (b. 1926) and the Iraqi painter-sculptor and philosopher, Shakir Hassan Al Said (b.1925) all searched for ways to use Arabic letters in abstract compositions.

The incidence of calligraffiti gathered momentum during the early 21st century when Middle Eastern street artists co-opted urban spaces for calligraffiti art designed to convey political or provocative statements. This street art practice was especially conspicuous during the wave of uprisings between 2010 and 2013, that became known as the Arab Spring thereby bringing the art form to the attention of international audiences. Certain calligraffiti artists have credited the Middle Eastern calligraphy artists as an important influence on their work. For instance, the Tunisian calligraffiti artist, el Seed points to the work of Iraqi painter, Hassan Massoudy as a major source of inspiration, noting that "The work of Hassan Massoudy was totally out of anything I’ve seen from the way he shapes the letters to the colors he uses. He completely revolutionized the art of calligraphy.”