is routes goes as redirection

Is CodeIgniter routes is redirection? like 301

A route isn't a redirect a route is just mapping a url to a controller/function. Route's tell CI what code needs to run for the url you are on. You would need to elaborate on the question more if that isn't what you are asking.

In CI4 you can use routes to redirect using 302 (default), other than that it's just a mapper.
https://codeigniter.com/user_guide/incom...ing-routes