The "MagSafe2" is the charging port. USB 3 will connect even faster to all standard USB devices.
The SDXC card slot will work for extra memory or photos, the USB 3 works with all standard USB devices, and Thunderbolt 2 is the 'display' port - your adaptor will connect this display port to HDMI cords.
What's this Adapter for?
You new MacBook Air will come with an adapter - so you can connect your 'Thunderbolt' display port to your projectors/displays in the classroom.
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