E-learning or Online learning refers to a learning environment that uses the web and alternative technological devices and tools for synchronous and asynchronous educational delivery and management of educational programs (Usher & Barak, 2020; Huang, 2019). The Efficacy of Online Learning is gaining quality globally over as a result of many of its options that had contributed to creating the method of education easy. The effectuality of online learning allowed students from across the world to recruit themselves during a form of programs, that is well accessible and permits for a bespoke learning experience. The Efficacy of Online Learning meets the need of an outsized population that will not want to attend a standard schoolroom or students who sleep in remote areas. Design/Methodology/Approach: Using the theoretical framework by Albert Bandura (1971) with four major sources of efficacy of individuals. the researcher concentrates on studying the efficacy of online learning among Senior Secondary Students of Mangalore Taluk with a sample size of 350 students.A standardized tool titled, ‘An Online Learning Self-Efficacy Scale (OLSES)’ of 22 items by Zimmerman and KuliKomich (2016) is used to check Efficacy of Online Learning. Descriptive Statistics of Mean, Median, Standard Deviation; Graphical Representation Normal Probability Curve and Ogive were used to analyse the data. Findings/Result: The study concludes that the Efficacy of Online Learning among Senior Secondary Students is normally distributed and it is also observed that 62.8% of the students fall in the category of Moderate self-Efficacy of Online Learning, 21.4% of the Senior Secondary Students are high self- Efficient with Online Learning, 15.85% of the Senior Secondary Students are low Self-Efficient with Online Learning. Originality/Value: The paper is based on the theoretical framework by Albert Bandura (1971) which assumes, if one has a confidence in completing a task, then there is more probability of being successful in it by this increased level of self-efficacy. There are four major sources of efficacy of individuals: mastery experiences, social modelling, verbal persuasion and physiological factors. Paper Type: Survey Research