ThisAll carts have a similar set of functions. They must be able to add items to the cart, change quantity of items in the cart and remove items from the cart. Ideally they should also be able to estimate shipping and taxes for an order and optionally allow for entry of promotional codes (aka coupons).
Because StoreBuilder is designed for customization with an open development layer, you can implement these core functions any way you like or remove/hide these functions.
The cart page by default will be routed to the /cart url. The cart page will describebe rendered using the shoppingCartViewModel cartclass (including any mixins or extenders for customization) and the sb-cart handlebars template in your active StoreBuilder theme.