Street art by Banksy in Bristol.

"Painting in the Global Tradition" by Ces53, a Dutch street artist

Don't Fly Away, street art by BLANK in New York City

Street art is like impressionism, cubism or pop art an art movement.

A lot of poor people try to survive by asking a little money in the street. They sometimes do the same while making art. These are the "original", "true" street artists. They make music, theatre, temporary paintings on the ground. The other ones are more likely called "urban artist".