Castilian is more used within the context of Spain, where Castilian is spoken besides Aranese, Basque, Catalan/Valencian and Galician (in fact, all five are official recognized languages of Spain). For any other Hispanic country with the exception of Spain, Spanish is the name of the language spoken there. In Mexico, most people speak Spanish.
Castilian is a term that is sometimes used to refer to the Spanish language. Spanish, or Castilian, is primarily spoken in Spain, where it is the official language. It is also spoken widely in many countries in Latin America, as well as in the United States and other parts of the world.
The language castilian was born from the original language of latin and is now recently speaked in few parts of Spain.
Latin American (Mexican) Spanish is spoken in Monterrey, Mexico. It subtly differs from Castilian Spanish, mostly in vocabulary and pronunciation. The clearest difference is the second-person pronoun, which is used as usted/ustedesin Mexico, while it is used as vos/vosotros in Spain.
Spanish, specifically, Castilian Spanish.
The type of Spanish spoken in Madrid is called Castilian. Castilian is the purest form of the Spanish language. It also is the spoken language in northern Spain.
Castilian refers to a specific dialect of Spanish spoken primarily in Spain, specifically in the region of Castile. Spanish, on the other hand, is a broader term that encompasses all the dialects and variations of the language spoken around the world. So, Castilian is a type of Spanish, but not all Spanish is Castilian.
In Spain. Here Castilian is a synonym of Spanish though some people may see "politic connotations" in the use of either name
Castilian Spanish is spoken by more than 90% of the population, either as a first or second language.
"Castilian" can refer to the Spanish language dialect spoken in the central region of Spain, specifically around the historic region of Castile. It can also refer to someone or something from that region.
The official language of Spain is Spanish (Castilian). Other languages spoken in specific regions include Catalan, Galician, and Basque.
Spain has the most speakers of Basque and Castilian (Spanish) of the countries. As for Catalonia, that is a region within the country of Spain and not a language.
Castilian is the only language spoken by a significant number of permanent residents of Castilla-La Mancha. The community does border the Comunidad Valenciana, which speaks Valencian (A dialect of Catalan).