Difference between VPAID and VAST

Sl. No.	VPAID	VAST
1	VPAID is Video Player Ad-Serving Interface Definition	VAST is Video Ad Serving Template
2	VPAID helps in establishing a common interface between the video ad and video player	VAST is universal specification developed by the IAB for serving video ads
3	VPAID helps to provide rich interactivity plus rich interaction, playback, etc. details which VAST alone can’t do	It only enables video ads to be served across all compliant video players i.e. it supports simple in stream video ad formats
4	VPAID enables ad interactivity	VAST enables common way of serving video ads on video players
5	It offers an API to facilitate increasing complexity in video advertising, enabling video players to accept more ads, and a platform that offers more value to advertisers and publishers alike	It provides uniform way for data to be passed from ad server to video players independent of any technology
6	VPAID enables the video player to preload an ad unit before rendering it	VAST does not have such feature
7	In simple words VPAID is a common language which helps in better communication between the video player and different ad servers, above to VAST it helps in transforming further details about the video ad activity on the player	Simply, VAST is a common language which helps in better communication between the video player and different ad server thereby helping to serve ads with an ease. No matter the ad is served via DFP, DCM, or any ad server the video player will understand and will display the ad