The Mac OS X 10.7 Lion is an operating system that was designed, developed, and sold by Apple from 2011 to 2012 alongside Apple’s personal computers. The system has been released on July 20, 2011, and was available for $29 from Mac App Store, on a USB thumb drive for $69, or was preinstalled on currently sold computers.
This software gets the last update (10.7.5) on October 4, 2012, and later has been replaced by a newer version OS X 10.8 Mountain Lion.
Mac OS X Lion introduced FaceTime, AirDrop, Emoji support, Mail 5, Adress Book, Address space layout randomization, Apple Push Notification Service, Auto Save, Auto-Correction, Exposé in Dock, FileVault, Finder improvements, Font Book 3, Full-screen apps, iCal and iChat updates, Launchpad, Multi-touch gestures from iOS, and many more.
Today Mac OS X 10.7 Lion is 12 years old!

Mac OS X 10.7 Lion General Information
Released | July 20, 2011 |
Original Price | $29 from the Mac App store $69 for a USB stick |
System Requirements | Mac with Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor 2 GB RAM 7 GB of hard disk space Mac OS X 10.6.6 or later |
Distribution | Mac App Store USB stick |
Versions
Versions | Build | Release Date |
Mac OS X 10.7 | 11A511 11A511s | July 20, 2011 |
Mac OS X 10.7.1 | 11B26 11B2118 | August 16, 2011 |
Mac OS X 10.7.2 | 11C74 | October 12, 2011 |
Mac OS X 10.7.3 | 11D50 11D50b 11D50d | February 1, 2012 |
Mac OS X 10.7.4 | 11E53 | May 9, 2012 |
Mac OS X 10.7.5 | 11G56 | September 19, 2012 |
Mac OS X 10.7.5 Supplemental Update | 11G63 | October 4, 2012 |