What defines street photography?

I was having a conversation with my friend @henrihadida the other day about street photography. He asked me if people needed to be present in a photograph for it to be considered street photography. I think I said something about how it needs to have a subject for it to be street photography. Like… a dog would do. Otherwise it’d just be an urban landscape photograph. I decided, tonight, to put my camera where my mouth is and go out and put this definition of mine to the test.