Difference between block-based design and platform-based design

Hi,

Block-based design information and document listed below:

https://www.intel.com/content/www/us/en/docs/programmable/683247/19-4/block-based-design-flows.html

https://www.intel.com/content/www/us/en/software/programmable/quartus-prime/block-based-design-flows.html

Platform-based design do you mean platform designer? Below is the platform designer information and document:

https://www.intel.com/content/www/us/en/docs/programmable/683609/23-1/creating-a-system-with.html

Thanks,

Best Regards,

Sheng