There are a few ways you can define “popular,” so you need to know what your goal is with learning a new language.
When people talk about the most popular languages, they usually talk about the most spoken languages — those with the most speakers. However, studying a language with fewer speakers might be more beneficial for you.
For example, while Mandarin Chinese has many more speakers than Spanish, people speak Spanish in more countries. Mandarin Chinese is the official language of only three countries (China, Taiwan, and Singapore), while Spanish is the official language in 20 countries. Also, in the United States, there are many more Spanish speakers than Chinese speakers.
So, if you want to learn a language to travel to many countries or even to communicate with more people at home (if you live in the US), Spanish would be a better choice than Mandarin.
What if you want to learn a language so you can watch more foreign-language films without subtitles or dubs? French will be your top choice if you are based in North America, followed by Spanish and German. They are the most common languages featured in films released in North America, with French as the main language in 12 percent of films.
So, a lot depends on what you’re interested in. Nevertheless, for this article, I will rank languages based on several factors, including how many speakers there are (both native and non-native), how useful the language is, and how popular it is among those studying a foreign language.
I will also let you know how many countries speak each language and where it is most commonly spoken, in case you are studying languages for travel purposes.