YouTube is testing a new tab in the iPhone app that is designed to help users find videos they may not have discovered on their own.
The new ‘Explore’ tab surfaces videos based on a user’s viewing activity.
However, since YouTube emphasizes users would not have otherwise encountered the content, it’s unlikely the videos will be from previously viewed channels.
In other words — the Explore tab will help expose YouTube viewers to new creators.
This is in contrast to the Home tab, which tends to feature recommended videos from channels that a user is regularly watching.