You can travel almost anywhere in the world, and you will probably see graffiti. Although graffiti art is usually more common in big cities, the reality is that it can occur in almost any community, big or small.
The problem with graffiti art is the question of whether it's really art, or just plain vandalism. This isn't always an easy question to answer, simply because there are so many different types of graffiti. Some is simply a monochrome collection of letters, known as a tag, with little artistic merit. Because it's quick to produce and small, it is one of the most widespread and prevalent forms of graffiti.
Although tagging is the most common type of graffiti, there are bigger, more accomplished examples that appear on larger spaces, such as walls. These are often multicolored and complex in design, and so start to push the boundary of whether they should really be defined as graffiti art.