Many of our users didn't understand 100% what VAST tags are so let's Explain them.

VAST or less known as “Video Ad Serving Template”

If you want to run video ads, it is important for you to understand the basics.
VAST ads are rich media video ads that are served by video ad servers and they are here to drive more brand awarness & engagement and also in some case to monetize your ad inventory.

To get started we are going to look at google as they are one of the main revenue sources google is generating via Adsense and Youtube

Here is main link to VAST documentation 

IMA VAST tags samples from video I used can be found here 

Video ad Inspector from video is here