Magento provides three redirect functions for front-end controller.
They are:
Now, let’s talk about them.
The first function is _redirect($path)
This function used for internal redirection.
The second function is _redirectUrl($path)
This function used for external redirection.
Third function is _redirectReferer()
This function used to redirect to the referral url.
As you can see, all functions has different roles to play. Thus, use them very wisely. Happy coding!