Compared to shared hosting, VPS hosting offers these advantages:

• You have greater control. With root server access, you can install the programs you want and configure them for your needs. You can reboot and back up and restore your VPS yourself.
• You have most of the advantages of a dedicated server at a significantly lower cost.
• You can host multiple websites and add the domains yourself.
• You have increased security by being autonomous.
• Only you and whoever you give permission to can access your accounts, databases, and files.
• Your site isn't affected by problems with other sites on the same server (outside of your VPS) or by other VPSes.
• You can host clients' sites and even offer private label reseller accounts.
  

As with anything else, there are some disadvantages of VPS hosting..

• You are responsible for maintaining the server, including security and updates. When problems develop, you need to find their cause yourself and fix them. However, with a fully managed VPS, you can leave the maintenance to someone else.
• If you choose to manage the VPS yourself, the work takes a lot of time.
• While you have your allotted amount of hardware resources, you still share these resources with other VPSes on the same server.
• Compared to shared hosting accounts, VPSes are more expensive.
  

Should you move your website from a shared hosting account to a VPS hosting account? If your site has no problems on a shared server, the answer is probably no. On the other hand, if your site is stretching the resources allotted to it, if the server it's on is performing less than optimally, or if increased control and performance are concerns, a VPS may be the next step for your website.