The gimmick of the Switch is simple: You can play it at home on a TV, or you can play it out in the world wherever you want. When you're home, you slap the tablet-like console into the included Switch Dock. Just like that, it's on the TV. When you're ready to leave, you pick it up and continue playing.
That gimmick, unbelievably, works. It's fast, and it's seamless.
Here's a real life example, from my very exciting life:
On Sunday evening, I played a few hours of "The Legend of Zelda: Breath of the Wild" before dinner. I used the Switch Pro controller to play the game from my couch on my TV. Around 7 p.m., I paused the game and put the console into Sleep Mode (the equivalent of closing a laptop or turning off a tablet screen — "off," but not all the way). I ate dinner with my wife while watching season two of "The Great British Baking Show" and fell asleep a few hours later.
On Monday morning, I woke up, showered, and got ready for work. When it was time to leave my apartment, I grabbed my MacBook and Nintendo Switch and threw them in my bag. While waiting for the F train, I took the Switch out of my bag and did some in-game errands I wanted to take care of (got that sweet black dye job on my armor).
The train arrived, and I tapped the power button on the top of the Switch, putting it into sleep mode again as I found a seat in the car. The subway left the station, and I started playing "Breath of the Wild" once more. A few moblin fights and one shrine later, I was at the 14th Street stop on the F train and, thus, near Business Insider's main office in Manhattan's Flatiron District.
I put the Switch to sleep once more and put it back in my bag. Seamless!