When the iPhone first launched, you synced your calendar by syncing your iPhone itself. You connected it to your Mac via USB, and your Mac’s copy of iCal and your iPhone would share calendar events. That’s a clunky approach to sharing data, even after iOS 5 introduced Wi-Fi syncing to the picture. Even with over-the-air syncing, you still have to re-sync your devices every single time you want your calendars to be current.
In an ideal world, your calendar would be in perfect sync on your Mac and your iPhone, without any manual syncing required. There must be a way to pull off this feat.
As a matter of fact, there are two. Let’s look at how each one works.