Pre-roll ads automatically play before a featured video. They range between 15 and 20 seconds long and in some platforms they can be skipped. These ads are practical if you want to increase engagement and conversion rates. Playing directly before featured video content means that you have a target audience that is engaged and there is a high probability that they will watch your ad for slightly longer without skipping. Research conducted by IPG Media Lab and YuMe shows that pre-roll video ads are effective for several metrics such as brand awareness, engagement, favorability and the intent to purchase. Moreover, they are considered to be more engaging, effective and informational when compared to outstream or mid-roll ads. On YouTube, they are similar to overlay ads, and they are displayed directly on the video player window. However, they fit the entire window instead of just the banner at the bottom, and they cannot be skipped like on other platforms.