-Redirect is a method that is used to issue the error message in case the page is not found or it issues a 302 to the browser. Whereas, render is a method used to create the content.

-Redirect is used to tell the browser to issue a new request. Whereas, render only works in case the controller is being set up properly with the variables that needs to be rendered.

-Redirect is used when the user needs to redirect its response to some other page or URL. Whereas, render method renders a page and generate a code of 200.

-Redirect is used as:
redirect_to: controller => ‘users’, :action => ‘new’

-Render is used as:
render: partial
render: new -> this will call the template named as new.rhtml without the need of redirecting it to the new action.

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