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Virtualization is a foundational technology in modern cloud and infrastructure security, enabling the abstraction of computing resources such as servers, storage, and networks from the underlying physical hardware. It allows multiple virtual machines (VMs) or virtual environments to run on a single physical host through the use of a hypervisor or virtual machine monitor (VMM). In the context of cloud computing, virtualization is essential for delivering scalable, elastic, and secure infrastructure services. Its important characteristics directly influence performance, resource utilization, flexibility, and security posture in cloud environments. One of the most significant characteristics of virtualization is abstraction. Abstraction separates the logical computing environment from the physical hardware. Users and applications interact with virtual resources rather than physical components. This abstraction enables cloud providers to pool physical resources and present them as virtualized compute, storage, and network units. From a security perspective, abstraction reduces direct exposure to hardware, limits hardware-level attacks, and allows centralized control over resource allocation and policy enforcement. However, it also introduces a layer that must be secured carefully, particularly the hypervisor, as it becomes a critical attack surface. Another key characteristic is isolation. Virtualization provides logical isolation between virtual machines running on the same physical host. Each VM operates as an independent environment with its own operating system, applications, and resources. Isolation ensures that processes or security breaches in one VM do not directly affect others. In cloud and infrastructure security, this isolation is crucial for multi-tenancy, where multiple customers share the same physical infrastructure. Strong isolation mechanisms prevent data leakage, privilege escalation, and cross-VM attacks. Hypervisor-enforced memory separation, CPU scheduling boundaries, and network segmentation are central to maintaining secure isolation. Resource pooling and sharing is another essential characteristic. Virtualization enables multiple virtual machines to share physical resources such as CPU cycles, memory, storage, and network bandwidth. The ________ _________ _____ __________ __________ _________ ______.
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