What’s new in OS X El Capitan? 
OS X El Capitan brings lots of useful enhancements to your Mac. New ways to manage multiple windows and spaces. An even more powerful Spotlight for searching your Mac and beyond. Refinements to essential apps like Photos, Safari, Mail, and Maps. An all-new Notes app for gathering your thoughts, photos, maps, web links, and more. And faster performance across the board — from gaming to launching apps to accessing mail. 

What is OS X? 
OS X is the operating system that makes it possible to do all the things you do on a Mac. It’s simple to do amazing things and delightful to do the everyday things. And it’s designed specifically to take advantage of everything your Mac is capable of. So if you use an iPhone, not only will you feel right at home on a Mac, but your Mac will work with your iPhone in ways no other computer can. 

Built-in apps. 
One of the best things about a Mac is that it comes loaded with beautifully designed apps you’ll love to use every day. In OS X El Capitan, those apps give you new and better ways to do the things you do most. Like surfing the web, managing your email, taking notes, and editing your photos. 

Learn more >>>  
http://www.apple.com/osx/whats-new/ 

Release: 2016 
Version: 10.11.3 (15D21) 
Developer: © Apple Inc. 
Source: Mac App Store (MAS) 
Platform: Intel only 
Language: Multilingual 
Tablet: Not required 
System requirements: 
64-bit, Intel, at least 2 GB of memory 
8 GB of free disk space