how does a zoom macro lens work?

What's the difference between a 35-105 macro zoom lens, and a 35-105 zoom
lens? (For example, I'm looking at the canon 35-105 F3.5 macro FD (72) / 2
touch. For that matter, I have no idea what the "(72)" or the "/2 touch"
mean.

I keep searching google for a basic site that explains details like this
(and the basics of how a zoom lens works) but haven't found one yet. Any
links would be much appreciated. TIA