Feeds are partner subscription bases where your advertisements are displayed. When you connect feeds to your advertising campaigns, your ad will be shown to the audience provided by these partner bases.
It is important to note that all the targeting options you have set up in your advertising campaign, such as devices, location, audience interests, and others, will also apply to the traffic from the feeds.
Enabling feeds increases the opportunity to reach a new audience and attract more potential leads. This is an additional source of traffic that can lead to increased effectiveness of your advertising campaigns and a higher number of users who will see your ads.