Difference between usual Magento 2 and ScandiPWA
ScandiPWA is a theme for Magento 2. It can be installed using composer.
Often, we do not have Magento 2 installed on our local host, or we do not want to install something manually - in that case, we have a docker setup.
In case you just want to run ScandiPWA locally using your remote server as a back-end.