Online learning is education that takes place over the Internet. It is often referred to as "E -learning". However, online learning is just one type of "distance learning" -the umbrella term for any learning that takes place across distance and not in a traditionalclassroom. Online learning means learning through internet. Peoples can get education through youtube, MOOC, Face book, Zoom etc. Pre-Covid 19 period, Teachers and students were completing on line courses due various advantages such as quick access, time saving, flexible timings and repetitive value.Objectives: To study the impact of online learning on students of Mumbai city and to understand which method of learning is better offline or online. Hypotheses of the research study were: H0: Online learning will not replace offline learning in near future.H1: Online learning will replace offline learning in near future.H0: Online learning doesn't provide quick results.H1: Online learning provides quick results.H0: Online learning is not better than offline learning.H1: Online learning is better than offline learning. Research methodology: Primary data was collected from 114 students from different colleges of Mumbai city and Secondary data was collected from books, research papers and websites. Simple Random sampling method and Likerts scale were used for data analysis and interpretations. Limitations of the study were time, money and research data was collected only from 114 students. The research paper will be useful to government to make educational polices and it will be useful to teachers to do further research. 35% respondents were disagree and 35% respondents were neutral when question was asked that online teaching is better than offline teaching. 72% respondents were agree that online learning provides quick exam results. 43% respondents were agree that online learning will replace offline learning in near future.\