For example, the superficial difference between rock climbing and “bouldering“.

Or, the difference between “hiking” and “mountaineering“.

The same thing in the realm of photography; is there a real difference between “Street photography”,“ urban photography“, or “life photography”? Or the more silly difference between “street photography“ and “street portraits”?

Also, does it matter for there to be a difference whether the street photo were shot with permission, or without permission?