I was in a meeting and they’re talking about these. I looked it up on the internet but I just can’t wrap my head around it. It feels like a buzzword to me that you say during interview but I want to understand it.
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SaaS = Software as a Service, is when you have a subscription in order to use a certain program. Netflix for example. Need subscription, it mostly works by downloading stuff from the servers, you stop paying and it stops working. Also Microsoft (Office) 365, where instead of buying a disk with Microsoft Office, you pay a subscription and you get the apps but also you can just log in through a website and get Word, Excel, etc. *in the browser*.
PaaS – Platform as a Service. This is where you have “a platform” and you can have many apps “interacting” with that platform. Facebook is an example, not because you can access your account through the internet, but because there are many apps that LINK TO and interact with the data that Facebook has. Facebook is the platform, and there are Facebook apps, some of them are games, that basically hook INTO Facebook and run from its data.
IaaS – Infrastructure as a Service – This is where you get the full “data center in the cloud”. What you’re renting here is computing power. Your employees log in via the internet into virtual computers, where they can click on icons and run programs and interact with databases and all that, all of them hosted “in the cloud” by a big corporation such as Google, Microsoft, etc. They have a huge datacenter that runs server racks, all with virtual machines running on them, and you basically rent “4 servers and 36 desktop workstations” (virtual machines of course) with whatever software you want to install on them.
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