Trending on YouTube helps viewers see and access what's new and what's happening on YouTube and in the world.
YouTube algorithm for selecting videos for the trending list is quiet different from what many think. People think videos with large amount of life time views appear on the list but this is untrue.
Trending videos are videos that have been able to gather a lot of views within a short period of time. When YouTube notice a video that has met this requirement, such video is added to the trending list.
Keep in mind that, trending on YouTube is not personalized. YouTube headquarters in every country determine what is trending in that country and it displays the same videos for all users in that country.
YouTube’s algorithm for selecting the trending videos is not just based on the total number of views of the channel. Many popular channels are not present in the trending list, but many viral videos with no subscribers initially can show up on the list. This is because the system detects the number of views in a short amount of time.
In addition, every country has a YouTube headquarters which places the video in the list as it is a limited section where only the, most viewed videos in the shortest while are found. To make your video trend you need to grasp rapid attention to rake in those views fast.