I started this because of a Reddit thread, of all things. Someone asked a simple question — what exactly counts as SaaS, technically — and the replies contradicted each other for pages. Is Twitter a SaaS? Is Airbnb? One person swore Tinder qualifies because the "product" is the connections you make, not the app itself. Another said Craigslist is technically SaaS but nobody calls it that anymore because it's become too ordinary to bother labeling. I went looking for a cleaner answer and found something more interesting: the term has a solid technical core, surrounded by a much fuzzier edge that even industry veterans argue about. The Part Everyone Actually Agrees On Strip away the debate, and the core definition holds up: software as a service means an application runs on someone else's infrastructure, and you access it over the internet — usually through a browser — instead of installing it on your own machine. The provider handles the servers, the security patches, ...



