A Dedicated server is a server that is hosted by a company and only allows one client company to access the server hereby giving you the full power and resources of the server. 

Dedicated servers can be used for a number of different applications, as they are very flexible. The most common use for a dedicated server is to run a web hosting environment, while other applications include database storage and access, custom virtualization setups, VPNs, email servers, applications and more

When you need more power, 0% downtime and real-time control, then it’s a good reason to have a dedicated server.

It all depends on your demand and what you intend to host.

A VPS is a virtual machine created from a physical server. A dedicated server is a physical machine without a virtualization layer. The advantage of a VPS is that the virtual resources can easily be scaled to suit your project’s needs — and this is beneficial in terms of both cost and flexibility.