A student can take the free online course and later write a formal certification exam (after paying a nominal exam fee). If the student passes the certification exam, she/he will get a certificate from the institute whose faculty offered the online course.
The NPTEL online courses program has been active since January 2014 and over the last two years has offered more than 90 online courses totalling close to 400,000 enrollments.
Posted by Ashwani Sharma, Country Head, University Relations, Google