Hi Rhawnt,
when a person is learning Spanish what he is learning especifically is Castillian, the language originated in a Spanish region, Castilla, spoken all over Spain by every Spaniard, and spoken in a lot of American countries with their specific variants, but, in Spain there are other languages like catalán, gallego, and others, spoken in some regions but not by every Spaniard.
In short, what is commonly called 'español' is 'castellano' ( in oppossition to catalan or gallego or euskera or asturiano...)
I hope it is clear ? If not, tell me and I'll explain more :)