Scalability (Vertical and horizontal scaling) Example : spilt-up, split-down, scale-out, spilt-in
Elasticity : If the system can scale automatically ,it is known as Automatic Scaling.
Agility : The ability of a system to react quickly.
High Availability : It is the ability of a system to operate continuously without failure for a designated period.
Fault Tolerance :
> The tolerance means the ability of a virtual machine to remain up and running during component and service failures.
> Fault tolerance refers to the ability of a system (computer, network, storage, etc.) to continue operating without interruption when one or more of its components fail.
Benefits of Cloud Computing :
Advantages of cloud computing -
Trade fixed expense for variable expense :
CAPEX :
> The upfront investment in acquiring the physical space, hardware, and staff to set up a data center is called CAPEX, capital expense, or fixed expense.
OPEX : 
> The investment in a technical team to keep the data center running is known as OPEX, Operational expense, or variable expense.
> It does not matter whether you use the full capacity of the data center or not, you have already invested the CAPEX amount and will have an ongoing OPEX.
> With Cloud computing, you will only have to pay monthly based on the resources you consume.
Benefit from massive economies of scale :
> When you do something on a large scale, the cost goes down.
> The cloud providers get the hardware and other infrastructure at a lower price because of the high volume.
** Stop guessing capacity
** Increase speed and agility
** Stop spending money running and maintaining data centers.
** Go global in minutes
Note : John Mc Carthy an american scientist gave idea of cloud computing
** AWS Access & Secret key : Other than AWS Management console, CLI and SDK are the two more methods to access AWWS.
Service Providers in Market :
Client-Server Computing :
Distributed Computing :
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