The company formerly known as Google is far bigger than most people realize (GOOG, GOOGL)

It's been more than a year since Google blew up its entire corporate structure to form a new parent company: Alphabet.

The shake-up was intended to help all of its businesses operate more efficiently, a move CEO Larry Page was working on for years as a secret project he called "Javelin."

This move also allowed Page to step back from day-to-day operations to "focus on the bigger picture."

Now, Alphabet is a massive corporation — ranking in size behind Apple, Samsung, and Microsoft— that encompasses everything from internet-beaming hot air balloons to self-driving cars to Google Cloud. 

Here's how all of Alphabet's companies fit under the umbrella. 

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Google officially became Alphabet in October, 2015, with the hope of allowing businesses units to operate independently and move faster. Google cofounder Larry Page is the CEO of the umbrella company, Alphabet.

Alphabet is divided into two main units: Google and Other Bets. Other Bets is best known for its "moonshot" R&D unit, X, but it also houses several other companies. Let's start with the smaller companies under Other Bets.

Nest builds smart thermostats and other home devices, like outdoor security cameras. The company was acquired by what is now Alphabet in 2014, and in June of last year, CEO Tony Fadell stepped down but remains within Alphabet. He was replaced by Marwan Fawaz.