Hello,Software as a Service or SaaS is a way of delivering applications over the Internet – as a service. Also known as cloud software, ASP, on-demand software or hosted software. The first applications for consumers were things like webmail, bookmarking and photo sharing. In business, things like recruitment, expenses and customer relationship management were among the early innovations. SaaS has since become a widely-used business model with more and more different kinds of applications available via the cloud.The benefits of SaaSIncreased efficiency and cost effectiveness are the reasons many businesses give for turning to cloud-based SaaS solutions. The advantages include:Low setup and infrastructure costsYou just pay for what you need with no capital expenditure that needs to be depreciated on your balance sheet over time.Accessible from anywhereJust connect to the internet and you can work from wherever you need to be via desktop, laptop, tablet or mobile or other networked device.ScalabilityYou can adapt your requirements to the number of people who need to use the system, the volume of data and the functionality required as your business grows.Industry leading service level agreements (SLAS) for uptime and performanceSo you have assurances that the software will be available to use when you need it – a difficult promise for in-house teams to make.Automatic, frequent updates Providers offer timely improvements thanks to their scale and because they receive feedback about what their customers need. This frees up your IT department for other more business-critical tasks.Security at the highest level required by any customerBecause of the shared nature of the service, all users benefit from the security level that’s been set up for those with the highest need.Need more details refer to this: https://www.salesforce.com/in/learning-centre/tech/saas/