What is the difference between `render` and `redirect_to`?

beginner

Re-explain

render: Renders a view template without a new HTTP request, maintains instance variables
redirect_to: Sends HTTP redirect response, triggers new request, loses instance variables

def create
  @user = User.new(user_params)
  if @user.save
    redirect_to @user  # New request to show action
  else
    render :new  # Renders new template with @user errors
  end
end

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