Up 119% year to date, Duolingo (NASDAQ: DUOL) is one of this year's best-performing stocks. Yet, many investors remain unfamiliar with the company and its business. So, let's dig in and see why Duolingo has been one of the year's big winners and whether it's too late to buy.

For those unfamiliar with Duolingo, the company's goal is to "make language learning fun, free, and effective for anyone who wants to learn, wherever they are." And with over 7,000 languages spoken by roughly 8 billion people on the planet, Duolingo has a huge addressable market.

At any rate, the company already offers courses in 43 different languages through its website and mobile app. Popular courses include Spanish, French, and English, but you can also find such offerings as Latin, Welsh, and Swahili.  

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Source Fool.com