IaaS: Infrastructure as a Service Only provides virtual machine,network and security, user has to install OS and software by themselves. The basic one.
PaaS: Platform as a Service Also provides database additionlly, but user has to manage and mantainence the database by themselves.
DaaS: Database as a Service Database is managed for user.
SaaS: Software as a Service User only needs to subscribe, no need to know how the infrastructure is managed.
