The new feature shows a list of products that were found in a specific video. This list will be shown in the block between the recommended videos. So YouTube wants to help users learn more about the product shown in the video.
The move appears to be aimed at giving Google its share of the lucrative affiliate link market, as well as directly linking commerce to videos on the platform.
Lists can also act as a second recommendation algorithm. YouTube will display videos featuring similar products. Time will tell whether users need such a function.