SLR and SLR like cameras

Hi,
I am a newcomer to photography.Just tell me the difference between a
SLR and SLR like camera.For example Canon EOS 350D is an (D)SLR and
Fuji S5500 is called an 'SLR like' camera..By single lens reflex I
suppose that what you see through the view finder is what you are going
to get as the image.i.e front end optics for both the viewfinder and
image capturing mechanism are same.

Both of these cameras satisfies my definition.But only one is qualified
as an SLR why ??