Let's you change the URL from your actions.
Use it for creating nice URL's when you have a Single Page App navigation system.

This let's you create book-markable URL's for Single Page App. (with some additional implementation required with "on Page Load workflow")

See how I use it and create a Single Page App navigation system here https://knowcode-tech.bubbleapps.io/version-test/navigation_system

Or use it for creating Anchor links inside documentation as you scroll down the page.

Or really helpful when Users send you screen shots and you are trying to figure out what they are looking at :-)

https://developer.mozilla.org/en-US/docs/Web/API/History_API/Working_with_the_History_API#the_replacestate_method