Language Variables vs Language Properties

[Rahul Patel]

Hi,

What is the difference between Language Properties that can be edited here?

vs adding Language Variables?

What is the use-case for each?  Also is there a way to pull all language variables via REST API?  I can only find this one that returns variable by key:

https://www.dotcms.com/docs/latest/rest-api-endpoints#I18NResource

Thanks!