If you want to transfer a large amount of product information between Shopify and another system, then you can use a specially-formatted spreadsheet to import or export that data. Shopify uses CSV (comma-separated value) files to perform this kind of bulk task.

You can use a CSV (comma-separated values) file to import products into your Shopify store, and to export products from your store. When you use a CSV file, you can import or export a large number of products and their details at same time. This can be helpful if you want to exchange product information between Shopify and other platforms.

You can download and view a sample product CSV file to use as a template. 

To learn more about importing products, read more details in Shopify Help Center.