This study examines the differences in online comments between educational videos and entertainment videos on YouTube. By employing content analysis of 2,000 comments, it examines the association between the different comment categories and the two genres of videos. For educational videos, the findings suggest that comments were enriching in terms of requesting further information, recommending videos, expressing opinion, commendation, disagreement, and sharing anecdotes as well as personal information. However, for entertainment videos, comments were enriching in terms of reflecting impression, compliments and expressing general sentiments. The potential implications from theoretical and practical perspectives are discussed.