How to turn your Mac's internet connection into a Wi-Fi hotspot with Internet Sharing
Wi-Fi is almost ubiquitous now but that doesn't mean it always comes cheap. Hotels especially love to nickel and dime people for Wi-Fi, sometimes offering different prices for slightly different speeds and often restricting or charging extra for multiple devices. If you're traveling internationally and want to avoid roaming costs on your mobile devices it can be especially aggravating. Luckily Apple makes it simple to share the Wi-Fi connection on your Mac with your iPhone, iPad, or even other Macs.
How to share your Mac's internet connection with your iPhone or iPad
Before beginning, be aware that Internet Sharing works for any computer running OS X Lion (10.6) or later.
Your Mac should now show up as a Wi-Fi hotspot for your iPhone, iPad, and similar devices. Simply connect to it like you would any other Wi-Fi network. You can even change the name of your Mac in the same Internet Sharing menu to make it easier to find if you'd like.