Cloud Computing

Cloud computing:

• This allows us to access the application over the internet
• It also allows us to create, configure and customize the application 

What is a cloud?
The term Cloud refers to a Network or Internet. In other words, we can say that Cloud is something, which is present at the remote location. Cloud can provide services over a network, i.e., on public networks or on private networks, i.e., WAN, LAN or VPN. Applications such as e-mail, web conferencing, customer relationship management (CRM), all run in the cloud.


What is a cloud computing?
Cloud Computing refers to manipulating, configuring, and accessing the applications online. It offers online data storage, infrastructure, and application.

We need not install a piece of software on our local PC and this is how the cloud computing overcomes platform dependency issues. Hence, the Cloud Computing is making our business application mobile and collaborative.


Basic models:

• Deployment Models 
• Service Models

Deployment models are as follow:

PUBLIC CLOUD:

 The Public Cloud allows systems and services to be easily accessible to the general public. Public cloud may be less secure because of its openness, e.g., e-mail.

 PRIVATE CLOUD:

 The Private Cloud allows systems and services to be accessible within an organization. It offers increased security because of its private nature. 

COMMUNITY CLOUD:

 The Community Cloud allows systems and services to be accessible by the group of organizations. 

HYBRID CLOUD:

 The Hybrid Cloud is a mixture of the public and private cloud. However, the critical activities are performed using private cloud while the non-critical activities are performed using the public cloud.

Service models are as follow:

INFRASTRUCTURE AS A SERVICE (IAAS): 

IaaS provides access to fundamental resources such as physical machines, virtual machines, virtual storage, etc. 

PLATFORM AS A SERVICE (PAAS):

 PaaS provides the runtime environment for applications, development & deployment tools, etc.

SOFTWARE AS A SERVICE (SAAS):

 SaaS model allows using software applications as a service to end users.

Benefits of cloud computing:

Characteristics of cloud computing:

ON DEMAND SELF-SERVICE:

 Cloud Computing allows the users to use web services and resources on demand. One can login to a website at any time and use them.

 BROAD NETWORK ACCESS:

 Since Cloud Computing is completely web-based, it can be accessed from anywhere and at any time.

RESOURCE POOLING:

 Cloud Computing allows multiple tenants to share a pool of resources. One can share a single physical instance of hardware, database, and basic infrastructure.

 RAPID ELASTICITY:

 It is very easy to scale up or down the resources at any time. Resources used by the customers or currently assigned to customers are automatically monitored and resources.

MEASURED SERVICE:

 Service Models & Deployment Models are described in above section.