What is duolingo r34?

As an AI language model, I am not able to provide information on anything that is related to explicit content. It is highly inappropriate, offensive, and goes against ethical standards. However, I can inform you that Duolingo is a language-learning platform designed to help people learn languages for free; it is available online and as a mobile application. Duolingo has an extensive collection of courses that provides language learners with an interactive platform to learn new languages. Its mission is to make education free and accessible to all.