When customers add items to a cart but do not check out, this creates an abandoned shopping cart.  You may keep track of shoppers' behavior by viewing Shopping Carts. 

Clicking View takes you to the detail of that abandoned cart.

The status tells you the step of checkout at which the cart was abandoned - or displays "Shopping Cart" if the customer did not attempt checkout.  If the cart was left by a registered user, the user's personal information will also display under Customer Name.

The list of abandoned carts is retained according to your site settings.  If a registered user re-enters your storefront with a saved cart and completes checkout, this process will remove the cart from View Shopping Carts.