Shopify's Google Shopping app syncs your Shopify store with your Google Merchant Center. You can use Shopify's Google Shopping app to run Google Shopping Campaigns and to list your products on Google Shopping.
Google Shopping listings make sure your products appear in Google's searchable paid directory of products. They also make sure your products are included in Google search results when potential customers search for the products you're selling. You pay for your Google Shopping ads only when customers click through on search results to visit your store's website or to view your store's inventory.
Shopify's Google Shopping app also lets you update Google product listing directly from your Shopify admin.