Glossary
SaaS (Software as a Service)
Software delivered over the internet on a subscription, typically multi-tenant and accessed via a browser or app.
Definition
Software as a Service is a delivery model where the vendor hosts the application centrally, customers pay a recurring subscription (per seat, usage or tier), and access is over the internet rather than via installed software. The vendor handles infrastructure, updates, security and uptime. Modern SaaS is almost always multi-tenant — one application serving many customer organisations from shared infrastructure with isolated data.
Why it matters
SaaS shifts software economics from capex to opex and pushes operational responsibility onto the vendor. For builders, designing for multi-tenancy, billing, RBAC and observability becomes the architecture's spine.
See also
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