The study looked at how using the Duolingo app can help students improve their English vocabulary. They wanted to see if it made learning more fun and if students liked using it. The researchers asked students at a high school in Tasikmalaya what they thought about using Duolingo. Most students agreed that it helped them learn vocabulary better. They also found that Duolingo made it easier to understand English, kept students interested, and helped them come up with new ideas for learning.