How Google Shopping works
1. Upload your products through the Google Merchant Center
You can upload your products with a data feed. You'll be taken to the Google Merchant Center to submit your product information.
2. Users find you on Google Shopping
Your products will appear on Google Shopping and may be displayed on Google.com. Your store and products will be shown to shoppers when they type in search terms relevant to your product offerings. Shoppers simply click on your listing to be brought to your site.