What is the frequently used with servers today to create several separate environments on a single server that act as separate servers?

Virtualization is frequently used with servers today to create several separate environments on a single server, allowing them to function as independent servers. This is typically achieved through hypervisors, such as VMware, Hyper-V, or KVM, which enable the creation of virtual machines (VMs) that can run different operating systems and applications. Containerization technologies like Docker also allow for lightweight, isolated environments, making it easier to deploy and manage applications.