Street Photography is a form of photography that involves, as the name suggests, photographing interesting scenes in the streets. Photographers such as Bruce Gilden heavily explored street photography with Bruce in particular becoming a very prominent figure in photography due to his work with him becoming a member of an elite group of photographers known as Magnum Photographers. They often employed a more objective approach to their work while still taking artistic liberties. When successfully executed these photos can very effectively portray socio-economic status and can really say a lot about someone as they often capture a candid moment which can show the facade that people will apply when in public in order to not expose any insecurities or appear vulnerable.
While street photography is often considered a form of portrait, not all portraiture necessarily needs to feature a human subject in the frame and there are various examples of creative examples of portraiture of still life subjects with either no human presence or minimal presence in order to push a particular message.