Update Domain 1- Cloud Computing Concepts and Architectures.md

Domain 1- Cloud Computing Concepts and Architectures.md

@@ -40,9 +40,9 @@ The ISO/IEC definition is very similar:
 
 >Paradigm for enabling network access to a scalable and elastic pool of shareable physical or virtual resources with self-service provisioning and administration on-demand.
 
-A (slightly) simpler way of describing cloud is that it takes a set of resources, such as processors and memory,  and puts them into a big pool (in this case, using virtualization). Consumers ask for what they need out of the pool, such as 8 CPUs and 16 GB of memory, and the cloud assigns those resources to the client, who then connects to them over the network and uses them. When the client is done, they can release the resources back into the pool for someone else to use.
+A (slightly) simpler way of describing an Infrastructure as a Service (Iaas) cloud is that it takes a set of resources, such as processors and memory,  and puts them into a big pool (in this case, using virtualization). Consumers ask for what they need out of the pool, such as 8 CPUs and 16 GB of memory, and the cloud assigns those resources to the client, who then connects to them over the network and uses them. When the client is done, they can release the resources back into the pool for someone else to use.
 
-A cloud can consist of nearly any computing resources — from our "compute" examples of processors and memory, to networks, storage, and higher level resources like databases and applications. For example, subscribing to a customer relations management application for 500 employees on a service shared by hundreds of other organizations is just as much cloud computing as launching 100 remote servers on a compute cloud.
+Hving said that, a cloud can consist of nearly any computing resources — from our "compute" or IaaS examples of processors and memory, to networks, storage, and higher level resources like middleware, web platforms and databases also know as Platform as a Service (PaaS), or complete applications, also know as Software as a Service (SaaS). For example, subscribing to a customer relations management application for 500 employees on a service shared by hundreds of other organizations is just as much cloud computing as launching 100 remote servers on a compute cloud.
 
 >Definition: a *cloud consumer* is the person or organization requesting and using the resources, and the *cloud provider* is the person or organization who delivers it. We also sometimes use the terms *client* and *consumer* to refer to the cloud consumer, and *service* or simply *"cloud"* to describe the provider. [NIST 500-292][3] uses the term "cloud actor" and adds roles for cloud brokers, carriers, and auditors.