Word
SaaS
SaaS is software you rent by the month instead of owning, which is how most business tools are sold.
Also called: software as a service, subscription software
SaaS stands for software as a service, and it means renting. You pay every month, the software sits on somebody else's computer, and you have it for exactly as long as you keep paying.
Most of what your business runs on is sold this way, and for plenty of it that's a fair deal, nobody should be building their own payment processing.
The word is in here because the whole argument of this course is about where that line falls: keep renting the hard, general things, and stop renting the small specific ones that only your business needs and nobody else will ever build properly.