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Extreme scalability
Customers such as Facebook use Chef to manage tens of thousands of servers using only a handful of employees.
Power
Chef is built on top of the Ruby programming language. When you need it, you have full access to the power of Ruby to customize Chef.
Choice
You are not locked into one way of using Chef. Chef can operate in a distributed standalone mode or in a centralized mode requiring a server. There are al...

From

Cover of Learning Chef

Note

other benefits and explanation