For any advertising method to be effective, it has to have a target audience that is consuming the medium with which the advertising is attached to. That being said, advertisers are starting to realize that online video advertising is now an effective method to attract large relevant audiences. Online video consumption has grown tremendously in the past few years and as a result, video sharing and video search companies are poised to reap the benefits of video advertising.

Due to the overwhelming demand from advertisers to develop effective methods for online video advertising delivery, some of the online video sharing giants have implemented various forms of online video ad formats. Historically, in-stream ads, also known as pre-roll ads, mid-roll, and post-roll, have been the dominant standard in terms of the format most advertisers gravitated towards due to the prominence of the ad content itself.

Pre-Roll Video Ads: Pre roll advertisements start before the video begins and the viewer has to sit through the entire advertisement, if he does not want to rely on chances, rather wants to ensure that ha can watch every single second of the video from its beginning.

Post-roll Ads - This format includes the advertisements at the end of the video clip and it is up to the viewer to decide whether to watch the advertisement clip or not. This format of advertisement is being used by certain video sites. However, this is not effective for the advertiser as often times users dont watch the entire video.

Mid-Roll Ads - This advertising format is where the clips are included in the middle of the videos so that the viewer goes through the video advertisement if he is curious enough to see the remaining part of the video, this format is also very popular with many of the video sites.

Many of the video platforms have experimented with various differnent online video formats. One of these is in-player ads: In-player ads sometimes include relevant text or image advertisements in the space available in video player between the outer margin of the video and the inner margin of the video player.

Contextual in-video advertising seems to be the way of the future with many different sites attempting to match videos with advertisements that are most relevant to the subject matter. Users like this format more as well as it does not disturb the experience of watching the entire video. This quality of the format makes it one of the most promising advertising formats for the future and there are many diverse ways in which to serve either images, clips, or text ads.

Some of the video sites like to go through the video and include only relevant in-video text advertisements, which match the contents of the video and at the same time it does not disturb the process of video watching by the viewer. Youtube was one of the first sites to adopt this format as a standard and it is called Overlay Video Ads.

I have given you a brief overview of the most common formats of video ads that are being tested and utilized at the moment. That being said, with growth being what it is, and video discovery as new as it is, we will certainly see many different companies innovating in regards to developing new and exciting formats for online video advertising.