With shared hosting, which is more common among small and medium sized businesses, the client pays for a set amount of space (storage) on a single server, and that server’s resources are shared by a number of other websites. It’s a cost-efficient, low-maintenance way to host a website or application, and the hosting company is responsible for managing, maintaining, and updating the units.
Rather than being hosted on one single instances of a physical server, hosting is delivered on a virtual partition which draws its resource, such as disk space, from an extensive network of underlying physical servers. If one server goes offline it will have no effect on availability, as the virtual servers will continue to pull resource from the remaining network of servers. 
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