With the number of vocabulary mastered by someone then wider range of knowledge. Vocabulary is very important in learning English, in addition to structure, grammar, pronunciation, because if a student does not master the vocabulary, it will be difficult for him to communicates what's on his mind well orally or in writing.
Based on the results of observations, it can be seen that So far, students' interest in following English learning is still lacking so that affect the level of mastery of language vocabulary.
Technology integration is important in this era of part of today’s society especially in the realm of education. Technology integration can make an interesting teaching and learning with the variations of the features of mobile application like Duolingo application that can support teaching and learning from EFL in Indonesia. This study finds that Duolingo application useful to be integrated in EFL language skills in Indonesia. This study also shows that Duolingo application useful in practice and increase their EFL learning process, particularly their vocabulary mastery and also their writing, reading, listening and speaking ability seen from some aspects; boost their confidence in learning English, encourage their participation in learning with fun an interest media in learning English, and help them to increase their English skills.
It is recommended that mobile application, particularly Duolingo application can be used and integrated in EFL classes in Indonesia. However, need to remember that teacher’s guidance is still needed to ensure the use of Duolingo application in EFL classes based with the purpose of teaching and learning objectives that has predetermined. Besides that, mobile phone can be used for another purposes outside of the realm of education, that’s why teachers also needed to ensure that students use mobile phone as a learning media, not for another activity or another purposes.
Students enrich their vocabulary using Duolingo Application
