Spanish is the native language of 339 million people in the world. In addition to Spain, Spanish is the official language of Argentina, Bolivia, Chile, Colombia, Costa Rica, Cuba, the Dominican Republic, Ecuador, El Salvador, Equatorial Guinea, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Uruguay, and Venezuela. In addition, it is widely spoken in several other nations, including Canada, Morocco, the Philippines, and the United States.
Mexico contains the largest population of Spanish speakers. Spanish is one of the six official languages of the United Nations. While all Spanish dialects use the same written standard, there are important variations spoken among the regions of Spain and throughout Spanish-speaking America. One major phonological difference between Castilian, broadly speaking, the dialects spoken in northern Spain, and the dialects of southern Spain and all the Latin American dialects of Spanish, is the absence of a voiceless dental fricative (/θ/ as in English thing) in the latter.
Spanish is one of the Romance languages in the Italic subfamily of the Indo-European language family, and within Spain, and has two major dialects: Andalusian and Castilian. Many other dialects exist in other geographical areas, namely North and South America. Spanish, French, Italian and Portuguese are essentially dialects of the same language. If you learn one, you can learn the others. If you learn Spanish, you open the door to the culture, music, history and possible business dealings with 800 million people in 60 countries, including the US and Canada.