The study focuses on the undergraduates’ academic performance and influence from YouTube. Non probability convenient sampling method has been utilized to select the sample. The sample included 60 undergraduates from a leading higher educational institute in Sri Lanka, representing three faculties (Business, Engineering and Computing). To collect the data, both quantitative and qualitative methods were used (in-dept. interview & questioners). Based on past literature, conceptual framework is derived. Through the indepth interview, reasons behind the excessive usage of YouTube are found. Usage patterns of You Tube are identified by using quantitative methods and identified that how its impact on undergraduate academic performance. Based on the findings of the study reveals that undergraduates primarily use YouTube as a mode of entertainment while few are using YouTube to enhance their knowledge in academic activities.