I agree with all the above answers, but I've a funny feeling that this might be a genuine question from someone much younger than me. Someone who has perhaps never seen a B&W television, for example.(posted 8700 days ago)'Black and white photography' is photography where there are no colours, just shades of grey. B&W film is camera film that records these shades of grey, and no colours. If you go to a library, doubtless many old books there will include B&W photos.
It's the only 'real' form of photography. All this modern colour stuff is just a fashion, it will soon go away.
[That last paragraph was a joke, I'm afraid.]