The Spanish Language is spoken in so many countries, some of them so far apart (Chile and Cuba, for instance) and others receiving very little Spanish cultural influence these days, that it's just natural that a few varieties of the Spanish language should have developed. Some of them even with dialects of their own.
The English Language has several well recognized varieties - BrE, AmE, AusE, SAE, CanE, etc. The Portuguese Language has European Portuguese and Brazilian Portuguese, which differ a lot in several aspects. Not to mention the African and Asian varieties. So, my question is: what are the main varieties of Castillan Spanish in the world? I don't expect a long discussion about each variety as I understand it would be completely off-topic here.
Si tú eres más competente en español, tienes libertad para responder como quieras. Yo comprendo muy bien.