In short, Infrastructure-as-a-service (IaaS) and Platform-as-a-service (PaaS) are very similar.
With an IaaS platform, in essence, we rent you the hardware, together with services for physical maintenance and virtualisation. You then decide how to manage and implement any software, operating systems, middleware, apps and data.
With PaaS, we take even more of the hassle off your hands, by and large. Above all, you simply need to manage are your data and your apps. Meanwhile, we just take care of the rest.