Enabling eCommerce for a Google Analytics view helps it collect and report on eCommerce data, such as Transactions, Revenue, and eCommerce Conversion Rate.
eCommerce tracking can be enabled in the Google Analytics Admin view settings section. This is the first step that is required.
The second involves ensuring that the eCommerce data is being sent from your website to Google Analytics. This usually involves your developer or the use of Google Tag Manager to set up. Instructions on how to do this second step can be found on Google's support page.