Course features differ based on whether you’re enroled in the audit (free) or verified (paid) track of a course. The paid (verified) track offers some value-adding features over the audit (free) track, like graded assignments and verified certificates.
A verified certificate shows that you have successfully completed an edX® course with a passing grade in the verified track, which you can use as a valuable credential to improve your job prospects and advance your career. For example, you can add the certificate to your LinkedIn profile or resume upon successful completion.
For more details about the difference of the audit (free) and the verified (paid) course, click here.
For more details about the verified certificate, click here.