From time to time, the Joomla team releases a new version of Joomla. Sometimes it adds new features, other times it fixes bugs or patches security problems. And, if you don't keep your Joomla installation up-to-date, you are inviting trouble from hackers.
Recently a new Joomla extension was released that makes it super-easy to keep your core Joomla files up-to-date. Install the "Joomla Update Manager" as you would any Joomla extension, and now you have a "one-click to update my core Joomla files" menu item in your administrator control panel.
Very simple, and the price can't be beat! It's free