The correct answer to this open question is the following.
There are around 5 different languages spoken in Spain. These languages represent a region in Spain. The Spanish we know and that is spoken in Latin and North America comes from or is an equivalent to Castilian or Castellano.
This is the Spanish that is spoken in most of the regions of Spain and was the language that Spanish conquerors took to México and South America when the conquered the Aztec Empire and the Inca Empire, among other regions of South America.
The other official languages spoken in Spain are Catalan, Aranés, Euskarian, and Galician.