* No central registry: There isn't a global organization tracking language usage in this way.
* Defining "second language": What constitutes a "second language" varies. Does it mean someone speaks it fluently, can hold a basic conversation, or just understands some phrases?
* Data collection challenges: Official censuses and surveys may not always accurately capture the number of people who speak a language as a second language, particularly in multilingual regions.
However, we can give you some estimates and context:
* Around 580 million people worldwide speak Spanish as a native language. This is the official language of 20 countries and is widely spoken in others.
* Spanish is the second most spoken language in the United States, after English. Millions of people in the US speak Spanish as a first or second language, driven by immigration and cultural influence.
* Spanish is a popular language for learning worldwide. This means millions of people are studying Spanish as a second language, adding to the overall number of speakers.
In summary, while an exact number is difficult to pinpoint, it's safe to say that hundreds of millions of people worldwide speak Spanish as a second language.