Which component is not directly associated with VMware vSphere?

VMware Workstation is primarily a desktop virtualization solution that allows users to run multiple operating systems on a single physical machine. It is designed for individual users and developers who need to create, test, and troubleshoot applications in various environments. While it can integrate with VMware vSphere for certain use cases, it is not a core component of the vSphere suite.

In contrast, VMware ESXi, vCenter Server, and the VMware vSphere Web Client are all integral elements of the vSphere infrastructure. ESXi is the hypervisor that enables the virtualization of physical servers, providing the foundation for running virtual machines. vCenter Server is essential for centralized management of ESXi hosts and virtual machines, allowing for scalability, resource allocation, and advanced features such as vMotion and DRS. The VMware vSphere Web Client serves as the graphical interface through which administrators manage and interact with vSphere environments, making it a critical part of the user experience.

Since VMware Workstation operates separately from the foundational architecture of vSphere and is more focused on personal or development environments rather than enterprise-level server virtualization, it is the component that does not directly associate with the VMware vSphere ecosystem.