The document discusses different definitions and types of street art. It defines street art as art found in or inspired by the urban environment, with anti-capitalist undertones. Street art encompasses various impermanent forms like stencils, stickers, and yarn bombing. While some see it as vandalism, others view it as a tool for political expression or urban beautification. The legal distinction between graffiti art and vandalism is permission, though many celebrated street artists began without permission.