what is `optimistic updates` in front-end development

Question

I\'m reading the intro to redux pattern, and there is the following paragraph there:

... consider the new requirements becoming common in front-end pr

Answer 1

In an optimistic update the UI behaves as though a change was successfully completed before receiving confirmation from the server that it actually was - it is being optimistic that it will eventually get the confirmation rather than an error. This allows for a more responsive user experience.