A Virtual Dedicated Server (VDS) is a virtual environment that runs on a powerful physical server in a data center. It is ideal for those who need reliable resources and more flexibility in management.
On a VDS, you have guaranteed resources (memory, CPU and disk) isolated from other clients. This means that even under load from other users, your server will run stably. You also get full access (root or admin) to customize as you see fit - this is very useful for installing specific applications and security.
Customers often choose VDS when they need the control, reliability and advanced features of a physical server, but at a more affordable price and without the need to manage physical hardware.