Cloud hosting's use of multiple servers gives it certain advantages over traditional hosting. For example, if your website experiences a sudden traffic spike, it can pull resources from another server to prevent slow page loads or, worse, the site going down. In addition, cloud hosting makes it incredibly simple for your to scale resources up or down, as needed.
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.