What is a state in <Link> component of React Router?

Question

Here is a screenshot from their docs about component

1. What state do they mean? A Redux state?

Answer 1

The the state property of the to prop is the param of pushState method of History DOM object described here

That props used in push/replace methods of router as described here for transitions to a new URL, adding a new entry in the browser history like this:

router.push('/users/12')

// or with a location descriptor object
router.push({
  pathname: '/users/12',
  query: { modal: true },
  state: { fromDashboard: true }
})

It also mentioned here:

router.push(path)
router.push({ pathname, query, state }) // new "location descriptor"

router.replace(path)
router.replace({ pathname, query, state }) // new "location descriptor"