You may or may not care, and I'm not trying to sound like an ass or anything but from what I've learned there is a difference between "close up" and true "macro" pictures.
True macro shots consist of the the image that is recorded on the film (sensor) being a 1:1 aspect ratio to the actual object being photographed. While this can be slightly confusing or unclear, what it means is that (and I'm going to use film for an example since its easier for me) if you were to take a macro shot of a penny, the image recorded on the 35mm film itself would be the exact same size as the actual penny if compared side to side.
If any of this is incorrect please feel free to correct me, I just thought I'd pass on a bit of friendly knowledge.