VMware ESX: In which ESX stands for Elastic Sky X is the server virtualization platform from VMware. VMkernel is the Virtualization kernel which is regulated by a console OS which is also known as the service console.

VMware ESXi: In which ESXi stands for Elastic Sky X Integrated is an enterprise server virtualization platform by VMware. Service console is not present in ESXi, the monitoring and management agents which are a part of the agents that are related to the VMware / the third party agents can work directly on the VMkernel.