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Software as a Service (SaaS) is a model of software distribution in which applications are hosted by a vendor or service provider and made available to customers over the Internet. SaaS applications are typically accessed through a web browser, and users do not need to install or download any software on their own computers. Instead, the software is maintained and updated by the vendor, and users can access it remotely from any device with an Internet connection. SaaS solutions are often subscription-based, with customers paying for access to the application on a monthly or annual basis.