MagSafe is a magnetic attachment technology for a more precise alignment between the iPhone 12 and a wireless charger, allowing for faster charging of up to 15 Watts. MagSafe cases allow for wireless chargers and other accessories to snap on to the iPhone and remain easily connected.

Read more about the iPhone 12 new wireless charging ecosystem here: https://www.macworld.com/article/3585789/iphone-12-magsafe-wireless-charging-cases-accessories.html