What is SaaS?

Most cloud computing service architectures fall into 3 broad categories:
· Infrastructure – As-A-Service
· Platform-As-A-Service
· Software-As-A-Service
Software as a service is a method of delivering software over the internet, on demand and typically on a subscription basis. With SaaS, cloud providers host and manage the software application and underlying infrastructure and handle any maintenance like software upgrades , users need not worry about. SaaS allows users to connect to and use cloud-based apps over the internet. Common examples include email, calendaring. The applications reside on remote cloud network accessed through web or API.
How does SaaS Work?
By means of what’s called multi tenant architecture, SaaS strictly delivers business software to thousands of customers. The cloud component simply implies an active connection to the internet and those devices and browsers that make access possible.
All the elements that define a software, from scripts, codes and algorithms, as well as the physical hardware in the form of servers and the structures that house them are kept and maintained by the vendors in their own facilities, a notable reversal in how deployment is carried out as mentioned earlier.
On the customer side, it means no upfront investment in servers or software licensing; on the provider side, with just one app to maintain, costs are low compared to conventional hosting.
What are some examples of SaaS?
Google Apps, Dropbox, Salesforce, Webex etc.

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