How do you know money is real

i only no for british notes but it might apply to other notes when yu hold it up against tha light there is a picture of the queens head. there is also a line through the middle that you can only see against the light there is holagram that is only visible if you put it under a machine that some shops have which i think has a special light or somethiing sorry for not being that helpful :( i only no for british notes but it might apply to other notes when yu hold it up against tha light there is a picture of the queens head. there is also a line through the middle that you can only see against the light there is holagram that is only visible if you put it under a machine that some shops have which i think has a special light or somethiing sorry for not being that helpful :(