Nowadays the term cloud is probably one of the most overused terms in the IT industry. For the purpose of this book the dešnition given by the National Institute of Standards and Technology (NIST) as published in March 2011 is used. Figure 2.1 shows on a high level how NIST sees the current cloud oĀerings in the market. However, there already are “®avors” of cloud services that NIST does not really address. We will take a closer look at some of them later in this chapter in “Beyond the Cloud.”