What is Unmanaged VPS? Unmanaged VPS is also known as Self-Managed Virtual Private Server, which means a server which entirely managed and maintained by the users itself. The hosting provider only responsible for is the availability of a functional physical server, but generally they provide a free Linux family of operating system to install and reinstall again and over again.
In Short, some technical knowledge, skill or experience related to run this server is needed, because they will have to start and build from the beginning including choose and install Operating System they prefer and also include other custom softwares. This type of hosting is much more cheaper than Managed VPS.