What are the different types of cloud services?

Cloud computing is an option for hardware or software and complete information technology (IT) infrastructure solutions.discuss the following:

• What are the different types of cloud services?
• What are the benefits and drawbacks of opting for a cloud service solution over an in-house IT solution?
• Why is there apprehension among IT professionals about cloud services?
• What do you consider to be the greatest risk in opting for a cloud-based solution?