SaaS, PaaS and IaaS are the three main cloud service models, each defined by how much of the technology stack the provider manages for you. IaaS rents raw infrastructure, PaaS adds managed runtimes, and SaaS delivers a finished application.
Public, private and hybrid cloud are the main cloud deployment models, describing where computing resources run and who shares them. Public cloud is shared provider infrastructure, private cloud serves one organisation, and hybrid connects the two.
Serverless computing is a cloud model where the provider runs code or services on demand and manages the servers behind them. Teams pay for actual usage rather than for idle capacity.
Cloud computing is the on-demand delivery of servers, storage, databases and software over the internet, paid for by usage. Teams rent capacity from a provider instead of buying and running their own hardware.
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