What is the main purpose of product groups in a Shopping campaign?

The main purpose of product groups in a Shopping campaign is to specify which products to advertise from your feed. This allows advertisers to organize their inventory and select particular products or categories that will be included in the campaign. By creating product groups, advertisers can control which products are shown to potential customers based on the attributes they choose, such as brand, category, or custom labels.

This targeting capability is crucial because it enables advertisers to optimize their bids and strategies for different segments of their product offerings. For instance, if an advertiser wants to focus on promoting seasonal items, they can organize those products into a specific product group and allocate a budget that aligns with their marketing goals.

Other options, such as defining keywords, creating remarketing lists, and categorizing products into themes, do not represent the primary function of product groups within Shopping campaigns. Instead, these options relate to different aspects of campaign management and targeting that are not directly concerned with product selection in Shopping ads.