If you never heard of the kiva robot watch the video below
Since buying robot startup Kiva Systems in 2012 Amazon has rapidly deployed an ever-growing fleet of robots into its warehouses, helping it store more goods in each of its fulfillment centers, letting it increase inventory breadth to better serve its customers.
...Total number of Kiva robots deployed by Amazon worldwide…
...2014: 15,000
...2015: 30,000
...2016: 45,000
...2017: 100,000