Introduced in the early 2000s, Virtual Machine (VM) Resource Allocation refers to the process of managing and distributing computing resources such as CPU, memory, storage, and network bandwidth among virtual machines running on a physical host. This practice is crucial for optimizing the performance and efficiency of virtualized environments, allowing administrators to allocate resources based on the needs of individual VMs while ensuring fair distribution and avoiding resource contention. Techniques for VM resource allocation include dynamic resource scheduling, workload balancing, and resource reservation to meet performance requirements and prevent over-provisioning or under-provisioning of resources. Efficient resource allocation enhances system utilization, reduces operational costs, and improves overall system performance.