Yep. It’s as simple as you think. A shopping cart is the online version of the cart you use at the grocery store.
Your cart will show you all the items you’ve added in one place. It will also usually show you the price of each individual item, the number of each item you currently have in your cart, and your subtotal.
It’s pretty common that shipping and taxes are calculated further along in the checkout process.
Here's an example of what you're probably used to seeing: