The cloud refers to a set of incredibly complex infrastructure technologies. At a fundamental level, it’s a collection of computers, servers, and databases that are connected together in a way that users can lease access to share their combined power.
The computing power is scalable so that buyers can dynamically increase or decrease the amount of computing power they lease.
The cloud can refer to anything that’s hosted remotely and delivered via the internet. While all cloud programs are run by underlying software, SaaS refers specifically to business software applications that are delivered via the cloud.