VPS Hosting is a short form for Virtual Private Server Hosting. As the name suggests, in VPS a Virtual server is created from the physical sever. It means that there is virtual division of sever resources like CPU, RAM and Storage etc. To be more precise this is done through the software called Virtualization software. It is impossible that we physically divide RAM, CPU etc i.e they cannot be broken into two halves to divide them, but virtually this can be done with ease. We can have a software like VMWARE which can divide resources as per our convenience.
We can get any portion of RAM, CPU or storage i.e like we can get 256 MB, 512MB or 1GB what we prefer and pay for portion rather than whole. The main benefit of VPS is that although a portion we still get guaranteed resources for our website.
Dedicated Server means that we get the full server resources whether we need it or not. If we need more resources we need to add them physically or change the server. In case we require fewer resources, we have to pay for the full server. Scalability is the major concern although performance will peak as 100% resources are at our disposal. The price will be high.
Cloud Servers Hosting is a redundant, scalable and flexible collection of servers in which we can use the resources according to our requirements at that instance. The major difference from VPS and Dedicated is that for both these, the resources are fixed for the given time period until we change them if needed. Like if the site is more loaded during day as compared to night, the resources are fixed the performance may deteriorate during the day if the load is more than which sever can handle and in the night if load is less, its wastage of server resources. For cloud server the server resources are automatically scaled to match the load and you pay per usage.
