A webcast is typically a one-to-many presentation conducted over the internet. Comparable to a traditional TV broadcast, a webcast is shown live via an internet stream. The recording is then stored on a web page for future viewing.
Whereas, a webinar is typically smaller and more collaborative and synergistic – similar to an interactive seminar, conducted over the internet. A webinar may contain Q&A chat functions, audience polling and present discussions.
Check out the comparison chart below.
A good chart that easy to understand the difference between them.