There are top-10 features that make a great product page, and one of them is to feature detailed product information. In your Shopify store you can go beyond standard list of fields for products, like item's title, its description, images, price, SKU, and so forth.
The attribute list above is great for most products. However, some items require non-standard attributes for their full presentation on the product page. For example, it could be a sensitivity value for headphones, material of the dress, charging current for a wall charger, calories for the candy, burn time for a candle, product expiration date, product ingredients, etc.
So, how do you list non-standard product attributes on a product page of a Shopify store? The answer is metafields (also known as custom fields).