Question

what is Cloud and IoT Operating Systems ?

Answer 1

Cloud : Its a global connection of servers kept at different remote places that interacts together and performs as single system.
The servers are used to store, manage or run application like playing a video on youtube or opening facebook url.Basically you
are accessing the files which is kept at different locations.

Different cloud resources :
Public cloud : Date and resources or services are avaialble to users via the medium of internet eg: free wifi.
Private Cloud : An organization internal services which they don;t want to be used by any other person apart from their employees.
Hybird Cloud : In this data or services are shared b/w two organization.

Iot OS: It is an operating system which is designed or made to work in a limited or restritive environment in relation to IOT devices.
IOT devices limited to memory size and data transfer.   

IOT OSes are used in small to big things like camera and Aircrafts and many others. One of the famous OSes is Fuchsia OS by google.