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diff --git a/Operating Systems/Virtualization.md b/Operating Systems/Virtualization.md
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index 0000000..b6e6d43
--- /dev/null
+++ b/Operating Systems/Virtualization.md	
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+---
+type: theoretical
+---
+- Hypervisor-Based Virtualization
+	- Utilizing hypervisor-based virtualization solutions like VMWare ESXi or Proxmox to create and manage multiple VMs on a single server.
+- Cloud computing
+
+## Requirements
+1. Safety: hypervisor should have **full control** of virtualized resources
+2. Fidelity: behaviour of a program on a virtual machine should be the same as if it were running bare metal
+3. Efficiency: Much of code should run without intervention by hypervisor
+
+
+## Popek and Goldberg
+
+Sensitive instructions behave differently in user vs. kernel mode. IO as an example.
+Privileged instructions cause a trap if executed in user mode.
+
+$$
+\text{Sensitive INS. } \subseteq \text{ Privileged Ins.}
+$$
+
+## Types
+![](Pasted%20image%2020250505205120.png)
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