Software as a service (SaaS) is a vendor or service provider hosted model and made available to customers over a cloud hosting. SaaS has become important nowadays because of the advantages such as reduced cost of ownership, reduced cost of hardware, software, tools, as everything is available on the Cloud. It doesn't require specialized workforce or support staff. The SaaS model offers efficiently, transparent communication, scalability. SaaS has the great advantage of minimum support and maintenance.