VMware vSphere is a virtualization platform that allows users to provision and manage one or more virtual machines on individual physical servers using the underlying resources. It enables organizations to optimize costs, centrally manage their infrastructure, and set up fault-tolerant virtual environments. The platform uses Distributed Resource Scheduler (DRS) and vMotion to automatically distribute shared physical resources to VMs based on their needs and ensure zero downtime during maintenance or when a server is overburdened. Monitoring performance and capacity management are crucial in vSphere, as poor resource allocation can lead to degraded performance or even downtime. Key metrics include summary metrics for high-level insight into infrastructure size and health, CPU usage, memory usage, disk metrics, network metrics, and tasks and events. These metrics help administrators track the status of their virtual environment, identify potential issues, and make informed decisions to optimize resource allocation and ensure optimal performance.