Final answer:
Graffiti is a form of visual art created on walls or public surfaces without permission. It can range from simple tags to elaborate murals and often involves spray paint. Graffiti has a long history and has been used as a form of expression and communication in various cultures.
Step-by-step explanation:
In the context of the given information, the graffiti drawn on Sophie's door is specified. However, Graffiti is a form of visual art that is typically created on walls or other public surfaces without permission. It can range from simple tags to elaborate murals, and often includes the use of spray paint. Graffiti has a long history and has been used as a form of expression and communication in various cultures.