Crap. We all know no such thing. Whoever wrote this idiocy - and I suspect it wasn't you; you probably cribbed it from some basher web-site - can't even transcribe a formula correctly, let alone understand it.
The equation is dS=dqrev/T. q (lower case) is the reversible heat, not the energy. Unless you specify it's the reversible heat, it's not correct to write it as a differential at all. Heat itself is a path variable.
While you're staying at home, Mom, pick up a chemistry text.