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Apple Thunderbolt to Ethernet adapter
In an effort to make the MacBook Pro as thin as possible, Apple has done away with the gigabit Ethernet port. So this isn't something that I use all that often—Wi-Fi has all but replaced it—but there are times when I have to resort to a wired connection.
This is where Apple's Thunderbolt to gigabit Ethernet adapter comes in handy. I can throw it into a notebook bag and it's there waiting for me when I need it.
Image source: Apple.