When a new shopping campaign is created, an ad group with a product group is created by default. What type of product group is this?

The selected answer option, An ‘all products’ product group, is correct because when a new shopping campaign is created in platforms like Microsoft Advertising or Google Ads, the default product group that is automatically created is an "all products" product group. This product group includes all the products in the merchant's feed, meaning that by default, every product from the inventory will be eligible to be included in the campaign unless further segmentation or exclusions are applied. This helps advertisers start their campaigns with broad coverage, ensuring that all products are initially part of the campaign, and they can later refine their targeting by creating additional product groups or setting specific targeting rules.