> Can you elaborate on this? I've always thought a mural was just a type of graffiti?

According to Wikipedia it’s the opposite: a graffiti is a type of mural [1]. However at least in French and in Italian a graffiti is an inscription on a wall, often done as vandalism, while a mural(e) is more like a fresco which often takes the full wall.

As a French, for me this [2] is a mural and this [3] is a graffiti.

[1]: https://en.wikipedia.org/wiki/Mural

[2]: https://www.parisenigmes.com/PICTURE/street-art-paris13.webp

[3]: https://cloudfront-eu-central-1.images.arcpublishing.com/lep...