SaaS, short for software as a service, is a way of delivering applications over the internet on a subscription basis. The provider hosts, updates and secures the software, and customers use it through a web browser or app rather than installing and maintaining it themselves.
Most SaaS products are multi-tenant, meaning many customers share the same underlying application and infrastructure while their data stays logically separated. Fees are usually monthly or annual and often depend on users, locations or volume. Updates are released by the vendor to everyone, and many products offer APIs so they can connect to other systems.
Retailers and hospitality venues commonly run POS, inventory, accounting, rostering, loyalty and analytics platforms as SaaS. It lets a new store start trading quickly, since little on-premises infrastructure is needed beyond devices and a reliable network.
Things to weigh include total subscription cost over time, how well the product integrates with the rest of your systems, data ownership and export options if you leave, and what happens to trading if the internet or the vendor's service goes down. Reviewing the vendor's uptime commitments, security practices and support hours is sensible. Having many separate subscriptions can also create data silos if they are not connected.
SaaS matters because it shifts technology from a large upfront purchase to a predictable running cost and removes much of the maintenance burden. It also makes multi-store rollouts simpler, because every site uses the same continuously updated platform.