Yiyan Technology Co., Ltd. is the company behind LingoDeer, an online platform and mobile application designed for language learning. Specializing in Asian languages such as Japanese, Korean, and Chinese, LingoDeer offers a structured curriculum that incorporates interactive lessons, quizzes, and exercises aimed at helping users develop reading, writing, listening, and speaking skills. The app is known for its user-friendly interface and engaging content, making it suitable for beginners and more advanced learners alike.