"The Cloud" simply refers to the Internet. In network diagrams the Internet would typically be represented by an image of a Cloud. It's as simple as that.
A typical example of SaaS would be Microsoft Office 365, where your emails are directed to a server that Microsoft hosts. You then retrieve your emails direct from the Microsoft data centre. Microsoft then hold responsibility for your mail server infrastructure and provisioning. This lowers the Total Cost of Ownership (TCO) of your IT Infrastructure.
Virtualization Software, or VMware empowers organizations to inovate and thrive by streamlining IT operations. By virtualizing infrastructure - from the data center to the cloud to mobile devices - VMware enables IT to deliver services from any device, anytime, anywhere.
That depends on your connectivity and needs. Its not a simple answer and is best weighed up by talking to us so we can help advise you on the best course of action. Cloud is good for some businesses, but not all! We can help provide you with the right equipment and support for your business so contact us and we'll be happy to help.