What does graffiti mean? You don't need to be so detailed, just be simple!

The word graffiti originated from Lu Tong's naughty trip of scribbling by his son in the Tang Dynasty, and then gradually evolved into an artistic act with the color of the times. The main medium of graffiti is the wall, but in the late 2th century, the medium on which graffiti depends is no longer the wall. In the 21st century, many young people combine graffiti with hip-hop elements in fashion and develop in a diversified way.