YouTube is now the second largest search engine behind Google, with over 1 billion unique users, 6 billion hours of videos watched each month. YouTube is a large part of many people’s lives, whether they are at home or on the go, making it a great platform to advertise. YouTube TrueView video ads mean you only pay when someone watches your ad. There are two ad formats available, In-Stream – Ads appear before a YouTube video, and In-Display – Ads appear in next to YouTube videos, or in the search results.