Description of Duolingo. Duolingo is one of the most popular and well-known tools for learning a language online. Duolingo is absolutely free but it is worth it. The free language learning app offers 11 completed language courses for English speakers, 2 beta languages and 8 languages still in progress. Duolingo also includes language courses for speakers of languages other than English. These includes French for Portuguese speakers, English for Czech speakers and so on. Features of Duolingo. Duolingo mimics the structure of video games in several ways in order to engage its users. There is a reward system in which users acquire "lingots", an in-game currency that can be spent on features such as character customizations or bonus levels. There are public leaderboards in which people can compete against their friends or see how they stack up against the rest of the world. The level system that Duolingo use is experience points, a numerical system that repres...
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