Software as a Service (SaaS)
Software as a Service (SaaS) is a cloud computing model in which a complete, ready-to-use application is hosted and managed entirely by the provider and delivered to users over the internet, typically through a web browser, with no…
Definition
Software as a Service (SaaS) is a cloud computing model in which a complete, ready-to-use application is hosted and managed entirely by the provider and delivered to users over the internet, typically through a web browser, with no infrastructure or maintenance required from the customer.
Overview
SaaS is the most abstracted of the three classic cloud service models — above Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) — because the customer doesn't manage any infrastructure, runtime, or even the application code itself. Instead, the customer simply uses the software, usually paying a recurring subscription fee based on seats, usage, or feature tier. Familiar consumer and business examples include email and productivity suites, CRM platforms like Salesforce, communication tools like Slack, and countless narrower business applications for HR, accounting, and customer support. The provider is responsible for everything: hosting, scaling, security patching, feature development, and uptime, which is why SaaS products typically publish a service level agreement (SLA) covering availability. SaaS has become the default way most organizations consume non-core software, since building and operating equivalent functionality in-house rarely makes economic sense outside of a company's core product. For organizations building their own products on top of cloud infrastructure, Backend as a Service (BaaS) offers a related but distinct model: rather than delivering a finished application, it delivers ready-made backend building blocks (auth, databases, storage) that developers assemble into their own SaaS product.
Key Concepts
- Fully hosted, ready-to-use application delivered over the internet
- No infrastructure, runtime, or maintenance responsibility for the customer
- Typically subscription-based pricing by seat, usage, or feature tier
- Provider handles hosting, scaling, security patching, and uptime
- Accessible from any device with a browser or client app, with minimal setup
- Frequent, provider-driven feature updates without customer-managed upgrades
Use Cases
Frequently Asked Questions
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