Mac OS X 10.4 Tiger was included with all new Macs, and was also available as an upgrade for existing Mac OS X users, or users of supported pre-Mac OS X systems.The server edition, Mac OS X Server 10.4, was also available for some Macintosh product lines.
Tiger was released to the public on April 29, 2005 for US9.95 as the successor to Mac OS X 10.3 Panther.
If you don't see an expected Mac update: Learn how to upgrade to the latest mac OS version, which includes the latest version of Safari and the Mac App Store.
You can set your App Store preferences to ”Download newly available updates in the background.” If you're using OS X El Capitan v10.11.5 or later, these updates include major new mac OS versions, such as mac OS Sierra.
Handoff requires an i Phone, i Pad, or i Pod touch with a Lightning connector and i OS 8 or later.
Instant Hotspot requires an i Phone or i Pad with cellular connectivity with a Lightning connector and i OS 8.1 or later.