A virtual private server runs its own copy of an operating system and customers may have user-level access to that operating system instance, so they can install almost any software that runs on that OS. For many purposes it is functionally equivalent to a dedicated physical server and being software-defined can much more easily be created and configured. A virtual server costs much less than an equivalent physical server. However, as virtual servers share the underlying physical hardware with other VPS, performance may be lower, depending on the workload of any other executing virtual machines.
All the details to this point are valuable to the web hosting experience, but none matches the critical importance of site uptime. If your site is down, clients or customers will be unable to find you or access your products or services. It doesn't matter how great the features are, or how good it looks; if your site is down, it might as well not exist.
Recently, Added more formal uptime monitoring to the review process, and the results show that most web hosts do an excellent job of keeping sites up and running. Even if they get everything else right, sites with uptime problems aren't eligible for high scores. All services suffer ups and downs, sometimes for reasons beyond their control. Those sites that fail to address the problem on time are penalized accordingly.
ByteNAP gives Best VPS Hosting Plans :
Quick deployment and Free Setup
Full Root access and Guaranteed resources
Multi-Processor KVM/OpenVZ Instances
Premium Bandwidth and Dedicated IP address
Latest Quad/Hexa Core Intel CPUs
OS templates and Control Panel options
Custom DNS and software configuration
Unlimited domain hosting
Tier III & IV Data Center with 99.95% Network Uptime
Guaranteed Resources in VPS Server.
VPS Basic plans Starting:
1-> 1 Core Processor
2 GB RAM
50 GB SSD Disk
500 GB Transfer
Free SSL/HTTPS
Unmanaged Services
2-> 2 Core Processor
4 GB RAM
80 GB SSD Disk
750 GB Transfer
Free SSL/HTTPS
Unmanaged Services
3-> 4 Core Processor
8 GB RAM
160 GB SSD Disk
1250 GB Transfer
Free SSL/HTTPS
Unmanaged Services
4-> 4 Core Processor
12 GB RAM
320 GB SSD Disk
1500 GB Transfer
Free SSL/HTTPS
Unmanaged Services