What is vMotion

A hot migration -- also known as a live migration -- is the process of migrating an active workload, such as a VM, from one physical machine to another. A vMotion-enabled service initiates a hot migration with zero downtime. This lets you replace or upgrade parts of the VM without a machine or system shutdown

vMotion can transfer the active memory and precise execution state of the virtual machine over a high-speed network, allowing it to switch from running on the source vSphere host to the destination vSphere host. vMotion keeps the transfer period imperceptible to users by tracking ongoing memory transactions in a bitmap. Once the entire memory and system state have been copied to the target vSphere host, vMotion suspends the source virtual machine, copies the bitmap to the target vSphere host and resumes the virtual machine on the target vSphere host. Transaction integrity is ensure

references:

https://www.vmware.com/in/products/vsphere/vmotion.html#:~:text=vMotion%20can%20transfer%20the%20active,to%20the%20destination%20vSphere%20host.