VMware ESX is an enterprise-level tool developed by VMware Inc. ESX is bare metal hypervisor that is installed straight into a physical server and enables it to be split into several logical servers. Being bare-metal the ESX software can be installed without the necessity of any operating system. These logical servers are referred as virtual machines(VM).
VMware ESX servers are used by enterprises that look to integrate their server hardware to the maximum extent. New servers can be deployed instantly to ensure there is no interruption in work at times when maintenance or repairs on existing servers are going on. Being free of hardware, the ESX servers can be moved with ease and is an effective way to save the applications and operating systems that run on them at times of any disasters. It is energy efficient and cuts down on power and cooling costs. It reduces on hardware deploying and maintenance expenses and makes it easy to manage the virtual machines remotely.