YouTube becomes the most visited video-sharing platform. On YouTube, there are many kinds of videos that students can watch. This research investigated the types of videos often watched by students on YouTube and the aspects of English improved through watching YouTube videos. The researcher conducted a qualitative research design using descriptive qualitative. The data were obtained from interviews with four female students’ batch 2015 of English Language Education Department in one private Islamic universities in Yogyakarta. The finding of the research revealed that there are three types of YouTube videos which were often watched by students such as art and humanities, vlog, and social science. Art and humanities include music videos or lyric videos, film, talks, sitcom, and talk show. Vlog consist of food vlog, beauty vlog, review video, haul vlog, and DIY videos. Social science focused on news and educational videos on YouTube. The finding also revealed the significant aspects of English improved through watching YouTube videos such as listening skills, speaking skill, pronunciation, vocabulary and also grammar.