Contrary to traditional card machines, Square Terminal is more than just for card payments. You can, for example, accept gift cards and edit your product library on the terminal.
From start to completion of each transaction, you use the touchscreen to navigate POS functions, like you would in the Square Point of Sale app for Square Reader. Customers enter their PIN on the touchscreen too.
All transactions and activities on the terminal are connected to your backend Square account where you can access more features, ecommerce and integrations with additional tools.