The flash provides a way to pass temporary objects between actions. Anything you place in the flash will be exposed to the very next action and then cleared out. This is a great way of doing notices and alerts, such as a create action that sets flash[:notice] = "Successfully created" before redirecting to a display action that can then expose the flash to its template. Actually, that exposure is automatically done. Example:

  class WeblogController < ActionController::Base
    def create
      # save post
      flash[:notice] = "Successfully created post"
      redirect_to :action => "display", :params => { :id => post.id }
    end

    def display
      # doesn't need to assign the flash notice to the template, that's done automatically
    end
  end

  display.rhtml
    <% if flash[:notice] %><div class="notice"><%= flash[:notice] %></div><% end %>

This example just places a string in the flash, but you can put any object in there. And of course, you can put as many as you like at a time too. Just remember: They‘ll be gone by the time the next action has been performed.

See docs on the FlashHash class for more details about the flash.

Methods
Classes and Modules
Class ActionController::Flash::FlashHash
Public Class methods
included(base)
    # File vendor/rails/actionpack/lib/action_controller/flash.rb, line 27
27:     def self.included(base)
28:       base.send :include, InstanceMethods
29: 
30:       base.class_eval do
31:         alias_method_chain :assign_shortcuts, :flash
32:         alias_method_chain :process_cleanup,  :flash
33:         alias_method_chain :reset_session,    :flash
34:       end
35:     end