REUTERS/Robert Galbraith
It's similar to the update Apple recently released for the iPhone earlier this month - like iOS 9, it's a subtle change that makes it easier to multitask. It's not an aesthetic change, so your Mac won't look or feel any different when you upgrade.
But there are a few handy features that you'll want to make use of once you install it. Here are the tricks I found most useful during the few days I've spent using the software.
(Note: This isn't a comprehensive list of everything that's new in El Capitan, it's just a compilation of the features that I found most useful).