Imagine this scenario: We have a view of certain content type nodes. This content type has field of type taxonomy term reference and we want to filter the view by taxonomy term ID. It means, we only want to display content assigned to particular taxonomy term. Easy, right? Obviously, you'd create this view on your local or development environment. Then you push the configuration on production and what??? The filter does not work! Why? Because the ID of the taxonomy term may be defferent on production website.