Can anyone tell me why two source type used in <audio> & <video> tag.

Question

This question am i asking from html 5 pls answer me quickly..

Answer 1

"Another aspect that the audio and video elements have in common is that the major browsers do not all support the same file types. If the browser does not support the first video type, it will try the next one."
--CopyPasted from HTML tutorial

Answer 2

Here is the tutorial
https://www.sololearn.com/learn/HTML/2193/?ref=app