What is the difference between murals and graffiti in terms of their artistic expression and cultural significance?

Murals are large-scale artworks typically created with permission and often convey positive messages or reflect the community's culture. Graffiti, on the other hand, is often unauthorized and can be seen as a form of rebellion or self-expression, sometimes carrying social or political messages. Murals are generally more accepted in mainstream culture, while graffiti is often associated with counterculture and can spark debates about public space and artistic freedom.